0001437749-22-025367 | 10-Q | XBRL Viewer | American Superconductor Corp DE

Note 12 - Income Taxes	6 Months Ended
Sep. 30, 2022
Notes to Financial Statements
Income Tax Disclosure [Text Block]	12. Income Taxes The Company recorded an income tax benefit of less than $0.1 million and an income tax expense of less than $0.1 million in the three and six months ended September 30, 2022, respectively. The Company recorded an income tax expense of $0.2 million and income tax benefit of $1.9 million in the three and six months ended September 30, 2021, respectively As a result of a difference in book and tax basis related to the intangible assets acquired in the Neeltran Acquisition (see Note 2, "Acquisitions"), the Company recorded a deferred tax liability of $2.3 million during the six months ended September 30, 2021. As a result, the Company was able to benefit from additional deferred tax assets and therefore released a corresponding valuation allowance of $2.3 million during the six months ended September 30, 2021. Goodwill recognized in the Neeltran Acquisition is not deductible for tax purposes. Accounting for income taxes requires a two-step approach to recognizing and measuring uncertain tax positions. The first step is to evaluate the tax position for recognition by determining if, based on the technical merits, it is more likely than not the position will be sustained upon audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount that is more than 50% likely to be realized upon ultimate settlement. The Company re-evaluates these uncertain tax positions on a quarterly basis. The evaluation is based on factors including, but not limited to, changes in facts or circumstances, changes in tax law, effectively settled issues under audit and new audit activity. Any changes in these factors could result in the recognition of a tax benefit or an additional charge to the tax provision. The Company did not identify any uncertain tax positions in the six months ended September 30, 2022 and did not have any gross unrecognized tax benefits as of September 30, 2022.

Note 12 - Income Taxes

6 Months Ended

Sep. 30, 2022

12. Income Taxes

The Company recorded an income tax benefit of less than $0.1 million and an income tax expense of less than $0.1 million in the three and six months ended September 30, 2022, respectively. The Company recorded an income tax expense of $0.2 million and income tax benefit of $1.9 million in the three and six months ended September 30, 2021, respectively

As a result of a difference in book and tax basis related to the intangible assets acquired in the Neeltran Acquisition (see Note 2, "Acquisitions"), the Company recorded a deferred tax liability of $2.3 million during the six months ended September 30, 2021. As a result, the Company was able to benefit from additional deferred tax assets and therefore released a corresponding valuation allowance of $2.3 million during the six months ended September 30, 2021. Goodwill recognized in the Neeltran Acquisition is not deductible for tax purposes.

Accounting for income taxes requires a two-step approach to recognizing and measuring uncertain tax positions. The first step is to evaluate the tax position for recognition by determining if, based on the technical merits, it is more likely than not the position will be sustained upon audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount that is more than 50% likely to be realized upon ultimate settlement. The Company re-evaluates these uncertain tax positions on a quarterly basis. The evaluation is based on factors including, but not limited to, changes in facts or circumstances, changes in tax law, effectively settled issues under audit and new audit activity. Any changes in these factors could result in the recognition of a tax benefit or an additional charge to the tax provision. The Company did not identify any uncertain tax positions in the six months ended September 30, 2022 and did not have any gross unrecognized tax benefits as of September 30, 2022.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 21
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32857-109319

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330215-122817

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 17
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32809-109319

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.5.Q1)
-URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 14
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32705-109319

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 270
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6424409&loc=d3e44925-109338

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI https://asc.fasb.org/topic&trid=2144680

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

Note 4 - Stock-based Compensation

6 Months Ended

Sep. 30, 2022

Notes to Financial Statements

Share-Based Payment Arrangement [Text Block]

4. Stock-Based Compensation

The Company accounts for its stock-based compensation at fair value. The following table summarizes stock-based compensation expense by financial statement line item for the three and six months ended September 30, 2022 and 2021 (in thousands):

	*Three Months Ended September 30,*				*Six Months Ended September 30,*
	*2022*		*2021*		*2022*		*2021*
Cost of revenues	$	78	$	21	$	107	$	112
Research and development		177		192		356		439
Selling, general and administrative		764		888		1,590		1,842
Total	$	1,019	$	1,101	$	2,052	$	2,393

The Company issued 338,500 shares of restricted stock awards during the three and six months ended September 30, 2022, and 25,806 shares of immediately vested common stock during the six months ended September 30, 2022. The Company issued 47,604 shares of immediately vested common stock, all of which were issued in lieu of cash bonuses, during the three months ended September 30, 2021, and 166,648 shares of immediately vested common stock, of which 158,356 shares were issued in-lieu of cash bonuses, and 309,700 shares of restricted stock awards during the six months ended September 30, 2021. These restricted stock awards generally vest over 2-3 years. Awards for restricted stock include both time-based and performance-based awards. For options and restricted stock awards that vest upon the passage of time, expense is being recorded over the vesting period. Performance-based awards are expensed over the requisite service period based on probability of achievement.

The estimated fair value of the Company’s stock-based awards, less expected annual forfeitures, is amortized over the awards’ service period. The total unrecognized compensation cost for unvested stock options was less than $0.1 million during the six months ended September 30, 2022. This expense will be recognized over a weighted average of approximately 1.7 years. The total unrecognized compensation cost for unvested outstanding restricted stock was $5.2 million at September 30, 2022. This expense will be recognized over a weighted-average expense period of approximately 1.6 years.

The Company granted 20,564 stock options during the six months ended September 30, 2022. The Company did not grant any stock options during the three months ended September 30, 2022 or the three and six months ended September 30, 2021. The stock options granted during the six months ended September 30, 2022 will vest over 2 years. The weighted average assumptions used in the Black Scholes valuation model for stock options granted during the six months ended September 30, 2022 are as follows:

Three Months Ended September 30,

Six Months Ended September 30,

2022

2021

2022

2021

Expected volatility

N/A

71.40

N/A

Risk-free interest rate

N/A

3.10

N/A

Expected life (years)

N/A

6.14

N/A

Dividend yield

N/A

None

N/A

Note 14 - Debt	6 Months Ended
Sep. 30, 2022
Notes to Financial Statements
Debt Disclosure [Text Block]	14. Debt As part of the Neeltran Acquisition, the Company identified four equipment financing agreements that Neeltran had entered into prior to the acquisition on May 6, 2021. The Company determined to account for these agreements as a debt transaction and recorded current and long-term debt liabilities of $0.1 million each during the three months ended June 30, 2021. The current and long-term debt balance is $0.1 million each as of September 30, 2022.

Note 14 - Debt

6 Months Ended

Sep. 30, 2022

Notes to Financial Statements

Debt Disclosure [Text Block]

14. Debt

As part of the Neeltran Acquisition, the Company identified four equipment financing agreements that Neeltran had entered into prior to the acquisition on May 6, 2021. The Company determined to account for these agreements as a debt transaction and recorded current and long-term debt liabilities of $0.1 million each during the three months ended June 30, 2021. The current and long-term debt balance is $0.1 million each as of September 30, 2022.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-URI https://asc.fasb.org/topic&trid=2208564

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (h)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1C
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1I
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1I
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(c))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (g)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1C
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1C
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1E
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1I
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (i)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

+ Details

Note 15 - Leases - Minimum Future Lease Obligation (Details) $ in Thousands	Sep. 30, 2022 USD ($)
2023	$ 506
2024	969
2025	778
2026	719
2027	579
Thereafter	357
Total minimum lease payments	3,908
Less: interest	(514)
Present value of lease liabilities	$ 3,394

Note 5 - Computation of Net Loss Per Common Share - Reconciliation of Numerators and Denominators of EPS Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net loss	$ (9,881)	$ (8,710)	$ (4,434)	$ (5,403)	$ (18,590)	$ (9,837)
Weighted-average shares of common stock outstanding (in shares)	28,775		28,360		28,648	28,141
Weighted-average shares subject to repurchase (in shares)	(908)		(1,108)		(934)	(1,101)
Shares used in per-share calculation ? basic (in shares)	27,867		27,252		27,714	27,040
Shares used in per-share calculation ? diluted (in shares)	27,867		27,252		27,714	27,040
Net loss per share ? basic (in dollars per share)	$ (0.35)		$ (0.16)		$ (0.67)	$ (0.36)
Net loss per share ? diluted (in dollars per share)	$ (0.35)		$ (0.16)		$ (0.67)	$ (0.36)

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 65
-Paragraph 1
-Subparagraph (e)(4)
-URI https://asc.fasb.org/extlink&oid=126732423&loc=SL123482106-238011

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22583-107794

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=126958026&loc=d3e1448-109256

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22595-107794

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 7
-URI https://asc.fasb.org/extlink&oid=126958026&loc=d3e1337-109256

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 65
-Paragraph 1
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=126732423&loc=SL123482106-238011

Reference 9: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI https://asc.fasb.org/extlink&oid=128363288&loc=d3e4984-109258

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(23))
-URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 15
-URI https://asc.fasb.org/extlink&oid=128363288&loc=d3e3842-109258

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22644-107794

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(25))
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126958026&loc=d3e1252-109256

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 60B
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=126958026&loc=SL5780133-109256

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(27))
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI https://asc.fasb.org/extlink&oid=128363288&loc=d3e4984-109258

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22644-107794

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 15
-URI https://asc.fasb.org/extlink&oid=128363288&loc=d3e3842-109258

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126958026&loc=d3e1252-109256

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22595-107794

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22583-107794

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 60B
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=126958026&loc=SL5780133-109256

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 65
-Paragraph 1
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=126732423&loc=SL123482106-238011

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(27))
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(23))
-URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 7
-URI https://asc.fasb.org/extlink&oid=126958026&loc=d3e1337-109256

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 65
-Paragraph 1
-Subparagraph (e)(4)
-URI https://asc.fasb.org/extlink&oid=126732423&loc=SL123482106-238011

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(25))
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(22))
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22595-107794

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(18))
-URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 65
-Paragraph 1
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=126732423&loc=SL123482106-238011

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 50
-Paragraph 6
-URI https://asc.fasb.org/extlink&oid=124431353&loc=SL124452729-227067

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(5))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(20))
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iv))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iii)(A))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(i))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(i))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22663-107794

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iv))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 17: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(ii))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22583-107794

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 60B
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126958026&loc=SL5780133-109256

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 8
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22658-107794

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669619-108580

Reference 25: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8924-108599

Reference 26: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794

Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 7
-URI https://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760

Reference 29: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1B
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669625-108580

Reference 30: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599

Reference 31: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(5))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 32: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(B))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 33: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(A))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 34: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599

Reference 35: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599

+ Details

Note 4 - Stock-based Compensation (Tables)

6 Months Ended

Sep. 30, 2022

Notes Tables

Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	*Three Months Ended September 30,*				*Six Months Ended September 30,*
	*2022*		*2021*		*2022*		*2021*
Cost of revenues	$	78	$	21	$	107	$	112
Research and development		177		192		356		439
Selling, general and administrative		764		888		1,590		1,842
Total	$	1,019	$	1,101	$	2,052	$	2,393

Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block]

Three Months Ended September 30,

Six Months Ended September 30,

2022

2021

2022

2021

Expected volatility

N/A

71.40

N/A

Risk-free interest rate

N/A

3.10

N/A

Expected life (years)

N/A

6.14

N/A

Dividend yield

N/A

None

N/A

Note 15 - Leases - Operating Lease Assets and Liabilities (Details) - USD ($)	Sep. 30, 2022	Mar. 31, 2022
Right-of-use assets - Financing	$ 4,200	$ 8,000
Right-of-use assets	3,274,000	3,502,000
Total right-of-use assets	3,278,000	3,510,000
Lease liabilities - ST Financing	4,000	7,000
Lease liabilities - ST Operating	818,000	740,000
Lease liabilities - LT Financing	0	1,000
Lease liabilities - LT Operating	2,572,000	2,900,000
Total lease liabilities	$ 3,394,000	$ 3,648,000
Weighted-average remaining lease term (Year)	4 years 3 months 29 days	4 years 11 months 4 days
Weighted-average discount rate	6.37%	6.36%

Note 9 - Inventory (Tables)

6 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	*September 30, 2022*		*March 31, 2022*
Raw materials	$	17,601	$	11,020
Work-in-process		14,591		10,462
Finished goods		3,254		1,326
Deferred program costs		896		858
Net inventory	$	36,342	$	23,666

Note 10 - Property, Plant and Equipment - Cost and Accumulated Depreciation of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022
Property, plant and equipment, gross	$ 58,764	$ 58,512
Less accumulated depreciation	(45,966)	(44,856)
Property, plant and equipment, net	12,798	13,656
Construction in Progress [Member]
Property, plant and equipment, gross	568	573
Land [Member]
Property, plant and equipment, gross	980	980
Building [Member]
Property, plant and equipment, gross	5,397	5,270
Equipment and Software [Member]
Property, plant and equipment, gross	43,652	43,668
Finance Lease, Right-of-use [Member]
Property, plant and equipment, gross	4	8
Furniture and Fixtures [Member]
Property, plant and equipment, gross	1,521	1,379
Leasehold Improvements [Member]
Property, plant and equipment, gross	$ 6,642	$ 6,634

Document And Entity Information - shares	6 Months Ended
Document And Entity Information - shares	Sep. 30, 2022	Oct. 28, 2022
Document Information [Line Items]
Entity Central Index Key	0000880807
Entity Registrant Name	AMERICAN SUPERCONDUCTOR CORP /DE/
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2022
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Entity File Number	0-19672
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-2959321
Entity Address, Address Line One	114 East Main St
Entity Address, City or Town	Ayer
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01432
City Area Code	978
Local Phone Number	842-3000
Trading Symbol	AMSC
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Common Stock, par value $0.01 per share
Entity Common Stock, Shares Outstanding		29,239,730

Note 13 - Contingent Consideration (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	$ (290)	$ (2,430)	$ (120)	$ (2,330)

Note 11 - Accounts Payable and Accrued Expenses (Tables)

6 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]

	*September 30, 2022*		*March 31, 2022*
Accounts payable	$	18,184	$	13,192
Accrued inventories in-transit		1,510		2,212
Accrued other miscellaneous expenses		5,370		3,602
Advanced deposits		2,965		3,021
Accrued compensation		5,589		4,642
Income taxes payable		411		405
Accrued product warranty		2,053		2,066
Total	$	36,082	$	29,140

Schedule of Product Warranty Liability [Table Text Block]

	*Three Months Ended September 30,*						*Six Months Ended September 30,*
	*2022*			*2021*			*2022*			*2021*
Balance at beginning of period	$	1,942		$	2,187		$	2,066		$	2,053
Acquired warranty obligations					-						248
Change in accruals for warranties during the period		479			206			656			314
Settlements during the period		(368	)		(238	)		(669	)		(460	)
Balance at end of period	$	2,053		$	2,155		$	2,053		$	2,155

Note 1 - Nature of the Business and Operations and Liquidity

6 Months Ended

Sep. 30, 2022

Notes to Financial Statements

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

1. Nature of the Business and Operations and Liquidity

Nature of the Business and Operations

American Superconductor Corporation (together with its subsidiaries, “AMSC®” or the “Company”) was founded on April 9, 1987. The Company is a leading system provider of megawatt-scale power resiliency solutions that Orchestrate the Rhythm and Harmony of Power on the Grid™ and that protect and expand the capability of the Navy’s fleet. The Company’s system level products leverage its proprietary “smart materials” and “smart software and controls” to provide enhanced resiliency and improved performance of megawatt-scale power flow.

These unaudited condensed consolidated financial statements of the Company have been prepared on a going concern basis in accordance with United States generally accepted accounting principles (“GAAP”) and the Securities and Exchange Commission’s (“SEC”) instructions to Form 10-Q. The going concern basis of presentation assumes that the Company will continue operations and will be able to realize its assets and discharge its liabilities and commitments in the normal course of business. Certain information and footnote disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to those instructions. The year-end condensed balance sheet data was derived from audited financial statements but does not include all disclosures required by GAAP. The unaudited condensed consolidated financial statements, in the opinion of management, reflect all adjustments (consisting of normal recurring adjustments) necessary for a fair statement of the results for the interim periods ended September 30, 2022 and 2021 and the financial position at September 30, 2022; however, these results are not necessarily indicative of results which may be expected for the full year. The interim condensed consolidated financial statements, and notes thereto, should be read in conjunction with the audited consolidated financial statements for the year ended March 31, 2022, and notes thereto, included in the Company’s Annual Report on Form 10-K for the year ended March 31, 2022 filed with the SEC on June 1, 2022.

Liquidity

The Company has historically experienced recurring operating losses and as of September 30, 2022, the Company had an accumulated deficit of $1,039 million. In addition, the Company has historically experienced recurring negative operating cash flows. At September 30, 2022, the Company had cash and cash equivalents of $27.8 million. Cash used in operations for the six months ended September 30, 2022 was $11.6 million.

In February 2021, the Company filed a shelf registration statement on Form S-3 that will expire in February 2024 (the “Form S-3”). The Form S-3 allows the Company to offer and sell from time-to-time up to $250 million of common stock, debt securities, warrants or units comprised of any combination of these securities. The Form S-3 is intended to provide the Company flexibility to conduct registered sales of the Company's securities, subject to market conditions, in order to fund the Company's future capital needs. The terms of any future offering under the Form S-3 will be established at the time of such offering and will be described in a prospectus supplement filed with the SEC prior to the completion of any such offering.

The COVID-19 pandemic continues to rapidly evolve. While the COVID-19 pandemic has not materially disrupted the Company's business to date, any future actions necessitated by the COVID-19 pandemic may result in disruption to the Company's business. In addition, the Company is experiencing substantial inflationary pressure in its supply chain, some delays in sourcing materials needed for its products and some production disruption resulting from higher than typical employee absenteeism, all of which have increased the Company’s cost of revenues and decreased gross margin. The extent to which the pandemic impacts the Company’s business, liquidity, results of operations and financial condition will depend on future developments, which are highly uncertain and cannot be predicted with confidence. Changes in macroeconomic conditions arising from the COVID-19 pandemic or for other reasons, such as the ongoing war between Russia and Ukraine, inflation, rising interest rates, labor force availability, sourcing, material delays and global supply chain disruptions could have a material adverse effect on the Company’s business, financial condition and results of operation.

The Company believes that based on the information presented above and its quarterly management assessment, it has sufficient liquidity to fund its operations and capital expenditures for the next twelve months following the issuance of the financial statements for the six months ended September 30, 2022. The Company’s liquidity is highly dependent on its ability to increase revenues, its ability to control its operating costs, and its ability to raise additional capital, if necessary. The impact of the COVID-19 pandemic and other sources of instability, including the war between Russia and Ukraine, on the global financing markets may reduce the Company's ability to raise additional capital, if necessary, which could negatively impact the Company's liquidity. There can be no assurance that the Company will be able to continue to raise additional capital, on favorable terms or at all, from other sources or execute on any other means of improving liquidity described above.

Note 7 - Fair Value Measurements - Derivative Liability Measured at Fair value (Details) - Derivative Financial Instruments, Liabilities [Member] - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Sep. 30, 2022	Mar. 31, 2022
Balance	$ 1,200	$ 7,050
Change in fair value	(120)	(5,850)
Balance	$ 1,080	$ 1,200

Note 11 - Accounts Payable and Accrued Expenses

6 Months Ended

Sep. 30, 2022

Notes to Financial Statements

Accounts Payable and Accrued Liabilities Disclosure [Text Block]

11. Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses at September 30, 2022 and March 31, 2022 consisted of the following (in thousands):

	*September 30, 2022*		*March 31, 2022*
Accounts payable	$	18,184	$	13,192
Accrued inventories in-transit		1,510		2,212
Accrued other miscellaneous expenses		5,370		3,602
Advanced deposits		2,965		3,021
Accrued compensation		5,589		4,642
Income taxes payable		411		405
Accrued product warranty		2,053		2,066
Total	$	36,082	$	29,140

The Company generally provides a one to three year warranty on its products, commencing upon delivery or installation where applicable. A provision is recorded upon revenue recognition to cost of revenues for estimated warranty expense based on historical experience.

Product warranty activity was as follows (in thousands):

	*Three Months Ended September 30,*						*Six Months Ended September 30,*
	*2022*			*2021*			*2022*			*2021*
Balance at beginning of period	$	1,942		$	2,187		$	2,066		$	2,053
Acquired warranty obligations					-						248
Change in accruals for warranties during the period		479			206			656			314
Settlements during the period		(368	)		(238	)		(669	)		(460	)
Balance at end of period	$	2,053		$	2,155		$	2,053		$	2,155

Note 4 - Stock-based Compensation - Stock-based Compensation Expense by Financial Statement Line Item (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Total stock-based compensation expense	$ 1,019	$ 1,101	$ 2,052	$ 2,393
Cost of Sales [Member]
Total stock-based compensation expense	78	21	107	112
Research and Development Expense [Member]
Total stock-based compensation expense	177	192	356	439
Selling, General and Administrative Expenses [Member]
Total stock-based compensation expense	$ 764	$ 888	$ 1,590	$ 1,842

Note 11 - Accounts Payable and Accrued Expenses (Details Textual)	6 Months Ended
	Sep. 30, 2022
Minimum [Member]
Extended Warranty Trigger Period (Year)	1 year
Maximum [Member]
Extended Warranty Trigger Period (Year)	3 years

Note 17 - Business Segments (Details Textual) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Number of Reportable Segments			2
Number of Operating Segments			2
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	$ (290)	$ (2,430)	$ (120)	$ (2,330)
Share-Based Payment Arrangement, Expense	1,019	1,101	2,052	2,393
Corporate, Non-Segment [Member]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	300	2,400	100	2,300
Share-Based Payment Arrangement, Expense	$ 1,000	$ 1,100	$ 2,100	$ 2,400

Note 5 - Computation of Net Loss Per Common Share (Details Textual) - shares shares in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	1.1	1.1	1.1	1.1
Shares Tied to Derivative Liability [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	1.0	1.0	1.0	1.0
Share-Based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	0.1	0.1	0.1	0.1

Note 3 - Revenue Recognition (Tables)

6 Months Ended

Sep. 30, 2022

Notes Tables

Disaggregation of Revenue [Table Text Block]

	*Three Months Ended September 30, 2022*				*Six Months Ended September 30, 2022*
Product Line:	*Grid*		*Wind*		*Grid*		*Wind*
Equipment and systems	$	24,128	$	1,330	$	42,204	$	3,302
Services and technology development		1,570		652		3,323		1,531
Total	$	25,698	$	1,982	$	45,527	$	4,833

Region:
Americas	$	18,021		-	$	34,923	$	-
Asia Pacific		6,178		1,912		8,855		4,763
EMEA		1,499		70		1,749		70
Total	$	25,698	$	1,982	$	45,527	$	4,833

	*Three Months Ended September 30, 2021*				*Six Months Ended September 30, 2021*
Product Line:	*Grid*		*Wind*		*Grid*		*Wind*
Equipment and systems	$	23,031	$	1,826	$	44,189	$	2,860
Services and technology development		1,588		1,463		3,930		2,349
Total	$	24,619	$	3,289	$	48,119	$	5,209

Region:
Americas	$	18,115	$	59	$	40,760	$	78
Asia Pacific		3,269		3,220		3,867		5,091
EMEA		3,235		10		3,492		40
Total	$	24,619	$	3,289	$	48,119	$	5,209

Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]

	*Unbilled Accounts Receivable*			*Deferred Program Costs*			*Contract Liabilities*
Beginning balance as of March 31, 2022	$	6,492		$	858		$	30,034
Increases for costs incurred to fulfill performance obligations					782
Increase (decrease) due to customer billings		(7,322	)					33,141
Decrease due to cost recognition on completed performance obligations					(697	)
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations		7,342						(26,857	)
Other changes and FX impact					(47	)		(863	)
Ending balance as of September 30, 2022	$	6,512		$	896		$	35,454

	*Unbilled Accounts Receivable*			*Deferred Program Costs*			*Contract Liabilities*
Beginning balance as of March 31, 2021	$	5,765		$	977		$	21,257
Increases for costs incurred to fulfill performance obligations		—			2,277			—
Increase for balance acquired		—			634			10,048
Increase (decrease) due to customer billings		(4,807	)		—			34,344
Decrease due to cost recognition on completed performance obligations		—			(3,055	)		—
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations		7,838			—			(34,169	)
Other changes and FX impact		—			(3	)		38
Ending balance as of September 30, 2021	$	8,796		$	830		$	31,518

Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]

Three Months Ended

Six Months Ended

Reportable

September 30,

Segment

2022

2021

2022

2021

Inox Wind Limited

Wind

<10%

Fuji Bridex Pte Ltd

Grid

<10%

Tri-State Generation and Transmission Association, Inc.

Grid

<10%

Micron Technology

Grid

<10%

Ascend Performance Materials Ops LLC

Grid

<10%

Note 7 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Oct. 01, 2020
Marketable Securities, Total	$ 0
Debt Securities, Available-for-sale, Unrealized Gain (Loss), Total	$ 0
Northeast Power Systems, Inc (NEPSI) [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High, Number of Shares (in shares)	1,000,000		1,000,000
Certificates of Deposit [Member]
Debt Securities, Available-for-sale, Unrealized Gain (Loss), Total		$ (100)

Note 5 - Computation of Net Loss Per Common Share

6 Months Ended

Sep. 30, 2022

Notes to Financial Statements

Earnings Per Share [Text Block]

5. Computation of Net Loss per Common Share

Basic net loss per share (“EPS”) is computed by dividing net loss by the weighted-average number of common shares outstanding for the period. Where applicable, diluted EPS is computed by dividing the net loss by the weighted-average number of common shares and dilutive common equivalent shares outstanding during the period, calculated using the treasury stock method. Common equivalent shares include the effect of restricted stock, exercise of stock options and warrants and contingently issuable shares. Stock options and warrants that are out-of-the-money with exercise prices greater than the average market price of the underlying common shares and shares of performance-based restricted stock where the contingency was not met are excluded from the computation of diluted EPS as the effect of their inclusion would be anti-dilutive. For each of the three and six months ended September 30, 2022, and 2021, 1.1 million shares were not included in the calculation of diluted EPS. Of these, 1.0 million relate to shares tied to the derivative liability for which the contingency has not yet been met, and 0.1 million relate to outstanding stock options as they were considered anti-dilutive.

The following table reconciles the numerators and denominators of the earnings per share calculation for the three and six months ended September 30, 2022 and 2021 (in thousands, except per share data):

	*Three Months Ended September 30,*						*Six Months Ended September 30,*
	*2022*			*2021*			*2022*			*2021*
Numerator:
Net loss	$	(9,881	)	$	(4,434	)	$	(18,590	)	$	(9,837	)
Denominator:
Weighted-average shares of common stock outstanding		28,775			28,360			28,648			28,141
Weighted-average shares subject to repurchase		(908	)		(1,108	)		(934	)		(1,101	)
Shares used in per-share calculation ― basic		27,867			27,252			27,714			27,040
Shares used in per-share calculation ― diluted		27,867			27,252			27,714			27,040
Net loss per share ― basic	$	(0.35	)	$	(0.16	)	$	(0.67	)	$	(0.36	)
Net loss per share ― diluted	$	(0.35	)	$	(0.16	)	$	(0.67	)	$	(0.36	)

Note 2 - Acquisitions - Purchase Price (Details) - USD ($) $ in Thousands				6 Months Ended
	May 06, 2021	Mar. 31, 2021	Oct. 01, 2020	Sep. 30, 2022	Sep. 30, 2021
Cash or Debt payment				$ (0)	$ 11,479
Neeltran Inc. [Member]
Cash or Debt payment	$ 4,400
Total consideration	16,400
Neeltran Inc. [Member] \| Neeltran Inc. Sellling Stockholders [Member]
Cash or Debt payment	1,000
Issuance of 301,556 shares of Company's common stock	4,400
Issuance of 873,657 shares of Company’s common stock	4,400
Neeltran Inc. [Member] \| Neeltran Third Party Lenders [Member]
Cash or Debt payment	$ 7,600
Northeast Power Systems, Inc (NEPSI) [Member]
Cash or Debt payment		$ 26,000	$ 26,000
Issuance of 301,556 shares of Company's common stock		12,400
Total consideration		42,400	$ 42,400
Issuance of 873,657 shares of Company’s common stock		12,400
Contingent consideration		$ 4,000

Note 1 - Nature of the Business and Operations and Liquidity (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Mar. 31, 2022	Feb. 28, 2021
Retained Earnings (Accumulated Deficit), Total	$ (1,039,097)		$ (1,020,506)
Cash, Cash Equivalents, and Marketable Securities	27,800
Net Cash Provided by (Used in) Operating Activities, Total	$ (11,572)	$ (11,734)
Inox Wind Limited [Member]
Supply Commitment, Default, Letters of Credit to be Received				$ 250,000

Note 4 - Stock-based Compensation (Details Textual) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Restricted Stock [Member]
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total (in shares)	338,500	338,500			309,700
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 5.2			$ 5.2
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				1 year 7 months 6 days
Restricted Stock [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)					2 years
Restricted Stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)					3 years
Immediately Vested Common Stock [Member]
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total (in shares)				25,806	166,648
Immediately Vested Common Stock Issued in Lieu of Cash Bonuses [Member]
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total (in shares)			47,604		158,356
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 0.1			$ 0.1
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				1 year 8 months 12 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	0		0	20,564	0

Note 2 - Acquisitions

6 Months Ended

Sep. 30, 2022

Notes to Financial Statements

Business Combination Disclosure [Text Block]

2. Acquisitions

2021 Acquisition of Neeltran

On May 6, 2021, the Company entered into a Purchase and Sale Agreement (the "Real Property Purchase Agreement") and a Stock Purchase Agreement (the "Neeltran Stock Purchase Agreement") with the selling equity holders named therein. Also on May 6, 2021, pursuant to the terms of the Real Property Purchase Agreement, the Company's wholly-owned Connecticut limited liability company, AMSC Husky LLC ("AMSC Husky"), purchased the real property that serves as Neeltran's headquarters for $4.3 million, of which (a) $2.4 million was paid in immediately available funds by AMSC Husky to the owners of such real property, and (b) $1.9 million was paid directly to TD Bank as full payment for the outstanding indebtedness secured by the mortgage on such real property.

Pursuant to the terms of the Neeltran Stock Purchase Agreement, the Company purchased all of the issued and outstanding shares of capital stock of Neeltran, Inc., a Connecticut corporation ("Neeltran") and Neeltran International, Inc., a Connecticut corporation ("International") for $1.0 million in cash and 301,556 shares of the Company's common stock, $.01 par value per share ("AMSC Shares"), that were paid and issued, respectively, to the Neeltran selling stockholders. The Company also paid $1.1 million to International selling stockholders to pay off previous loans made by them to Neeltran.

Additionally, the Company paid approximately $7.6 million, including $1.9 million of indebtedness secured by the mortgage on the real property as described above, directly to Neeltran lenders at closing to extinguish outstanding Neeltran indebtedness to third parties. The total purchase price of $16.4 million includes cash paid, the fair value of the AMSC Shares issued at closing and the debt payoff on behalf of the sellers as follows (in millions):

Cash payment	$	4.4
Issuance of 301,556 shares of Company's common stock		4.4
Debt payment to third party lenders on behalf of sellers		7.6
Total consideration	$	16.4

The Neeltran Acquisition completed by the Company during the fiscal year ended March 31, 2022 has been accounted for under the purchase method of accounting in accordance with ASC 805, Business Combinations. The Company allocated the purchase price to the assets acquired and liabilities assumed at their estimated fair values as of the date of Neeltran Acquisition. The excess of the purchase price paid by the Company over the estimated fair value of net assets acquired has been recorded as goodwill. As Neeltran was previously a private company, the adoption of Accounting Standards Codification 842 ("ASC 842") was completed as part of the Neeltran Acquisition. See Note 15, "Leases" for further details. Neeltran had previously adopted Accounting Standards Codification 606, Revenue from Contracts with Customers ("ASC 606") as part of prior year audited financial statements.

The following table summarizes the allocation of the purchase price based on the estimated fair value of the assets acquired and liabilities assumed in connection with the Neeltran Acquisition (in millions):

Cash and short-term investments	$	0.5
Net working capital (excluding inventory and deferred revenue)		(0.9	)
Inventory		9.0
Property, plant and equipment		6.5
Deferred revenue		(10.0	)
Deferred tax liability		(2.3	)
Net tangible assets/(liabilities)		2.8

Backlog		0.1
Trade names and trademarks		1.2
Customer relationships		3.5
Net identifiable intangible assets/(liabilities)		4.8

Goodwill		8.8

Total purchase consideration	$	16.4

Inventory include s a $0.6 million adjustment to step up the inventory balance to fair value consistent with the purchase price allocation. The fair value was based on the estimated selling price of the inventory, less the remaining manufacturing and selling cost and a normal profit margin on those manufacturing and selling efforts. The inventory step up adjustment increased cost of revenue by $0.6 million in the twelve month period ended March 31, 2022 as the inventory was sold. This increase is not reflected in the pro forma condensed combined statements of operations because it does not have a continuing impact beyond the first year.

Backlog of $0.1 million was evaluated using the multi period excess earnings method under the income approach. The contracts with customers do not provide for any guarantees to source all future requirements from the Company. The amortization method being utilized is economic consumption estimated over a two year period with the expense being allocated to cost of revenues.

Customer relationships of $3.5 million relates to customers currently under contract and was determined based on a multi period excess earnings method under the income approach. The method of amortization being utilized is the economic consumption over 7 years with the expense being allocated to SG&A.

Trade names and trademarks of $1.2 million were reviewed using the assumption that the Company would continue to utilize the Neeltran trade name indefinitely. The relief from royalty method was utilized using a 1% royalty rate on revenues with a 24.5% discount rate over 15 years.

The goodwill represents the value associated with the acquired workforce and expected synergies related to the business combinations of the two companies. Goodwill resulting from the Neeltran Acquisition was assigned to the Company's Grid business segment. Goodwill recognized in the Neeltran Acquisition is not deductible for tax purposes. The Company has finalized its purchase price allocation for the Neeltran Acquisition, and there were no changes to the net assets and goodwill recorded by the Company as of May 6, 2021.

Unaudited Pro Forma Operating Results

The unaudited pro forma condensed consolidated statement of operations for the three and six months ended September 30, 2022 and 2021 is presented as if the Neeltran Acquisition had occurred on April 1, 2021.

	*Three Months Ended September 30,*						*Six Months Ended September 30,*
	*2022*			*2021*			*2022*			*2021*
Revenues	$	27,680		$	27,908		$	50,360		$	56,158
Operating loss		(8,092	)		(4,302	)		(16,975	)		(11,686	)
Net loss	$	(9,881	)	$	(4,434	)	$	(18,605	)	$	(12,127	)

Net loss per common share
Basic	$	(0.35	)	$	(0.16	)	$	(0.67	)	$	(0.45	)
Diluted	$	(0.35	)	$	(0.16	)	$	(0.67	)	$	(0.45	)
Shares - basic		27,867			27,252			27,714			27,101
Shares - diluted		27,867			27,252			27,714			27,101

The pro forma amounts include the historical operating results of the Company, and Neeltran, with appropriate adjustments that give effect to acquisition related costs, income taxes, intangible amortization resulting from the Neeltran Acquisition and certain conforming accounting policies of the Company. The pro forma amounts are not necessarily indicative of the operating results that would have occurred if the Neeltran Acquisition and related transactions had been completed at the beginning of the applicable periods presented. In addition, the pro forma amounts are not necessarily indicative of operating results in future periods.

Acquisition of NEPSI

On October 1, 2020 (the "NEPSI Acquisition Date"), the Company entered into a Stock Purchase Agreement (the "NEPSI Stock Purchase Agreement") with the selling stockholders named therein. Pursuant to the terms of the NEPSI Stock Purchase Agreement and concurrently with entering into such agreement, the Company acquired all of the issued and outstanding (i) shares of capital stock of Northeast Power Systems, Inc., a New York corporation ("NEPSI"), and (ii) membership interests of Northeast Power Realty, LLC, a New York limited liability company, which holds the real property that serves as NEPSI's headquarters (the "NEPSI Acquisition"). NEPSI is a U.S.-based global provider of medium-voltage metal-enclosed power capacitor banks and harmonic filter banks for use on electric power systems. Prior to the NEPSI Acquisition, the Company had purchased $0.4 million of products from NEPSI in fiscal year 2019 for which NEPSI was paid and had recorded revenue.

Pursuant to the NEPSI Stock Purchase Agreement, the Company acquired all of the issued and outstanding shares of NEPSI, and membership interest in the realty entity, for which the Company paid $26.0 million in cash and issued 873,657 restricted shares of the Company’s common stock. Additionally, the Company may issue to the selling stockholders up to an additional 1,000,000 shares of common stock upon NEPSI’s achievement of specified revenue objectives during varying periods of up to four years following closing of the NEPSI Acquisition. This contingent consideration is recorded as a derivative liability based on a Monte Carlo simulation to determine fair value at the time of issuance. NEPSI is now a wholly-owned subsidiary of the Company and is operated and reported as a component of its Grid business unit.

The NEPSI Acquisition completed by the Company during the fiscal year ended March 31, 2021 has been accounted for under the purchase method of accounting in accordance with ASC 805, Business Combinations. The Company allocated the purchase price to the assets acquired and liabilities assumed at their estimated fair values as of the date of NEPSI Acquisition. The excess of the purchase price paid by the Company over the estimated fair value of net assets acquired has been recorded as goodwill. As NEPSI was previously a private company, the adoption of ASC 606 was completed as part of the NEPSI Acquisition. See Note 3, "Revenue Recognition" for further details. There were no leases acquired and the NEPSI Acquisition had no impact to the Company's reporting under ASC 842.

The total purchase price of approximately $42.4 million includes the fair value of shares of the Company’s common stock issued at closing, cash paid, and contingent consideration as follows (in millions):

Cash payment	$	26.0
Issuance of 873,657 shares of Company’s common stock		12.4
Contingent consideration		4.0
Total consideration	$	42.4

Total consideration consists of (a) cash of $26.0 million, (b) issuance of the Company's common stock, using $14.23 per share, which was the closing price on the day that the Company acquired NEPSI, and (c) $4.0 million of contingent consideration for the earnout liability valued as of the NEPSI Acquisition Date. NEPSI Acquisition costs of $0.3 million were recorded in selling, general and administrative ("SG&A") costs for the fiscal year ended March 31, 2021.

The fair value of the contingent consideration was determined using a Monte Carlo model and is accounted for as a derivative liability which is revalued at the fair value determined at each subsequent balance sheet date until the contingencies are resolved and the shares to be issued are determined, with the change in fair value recorded in the current period operating loss or (income). See Note 13, "Contingent Consideration" for further details and a summary of key assumptions used to determine fair value in each period.

The following table summarizes the allocation of the purchase price based on the estimated fair values of the assets acquired and liabilities assumed and related deferred income taxes in connection with the NEPSI Acquisition (in millions):

Net working capital (excluding inventory and deferred revenue)	$	0.1
Inventory		4.2
Property, plant and equipment		2.3
Deferred revenue		(2.7	)
Deferred tax liability		(1.7	)
Net tangible assets/(liabilities)		2.2

Backlog		0.6
Trade names and trademarks		0.6
Customer relationships		6.1
Net identifiable intangible assets/(liabilities)		7.3

Goodwill		32.9

Total purchase consideration	$	42.4

Inventory includes a $1.0 million adjustment to step up the inventory balance to fair value consistent with the purchase price allocation. The fair value was determined based on the estimated selling price of the inventory, less the remaining manufacturing and selling cost and a normal profit margin on those manufacturing and selling efforts. The $1.0 million step up adjustment increased cost of revenue in the fiscal year ended March 31, 2021 as the inventory was sold. This increase is not reflected in the pro forma condensed combined statements of operations because it does not have a continuing impact beyond the first year.

Backlog of $0.6 million was evaluated using the multi period excess earnings method under the income approach. The contracts with customers do not provide for any guarantees to source all future requirements from the Company. The amortization method being utilized is economic consumption estimated over a two year period with the expense being allocated to cost of revenues.

Customer relationships of $6.1 million relates to customers currently under contract and was determined based on a multi period excess earnings method under the income approach. The method of amortization being utilized is the economic consumption over 7 years with the expense being allocated to SG&A.

Trade names and trademarks of $0.6 million were reviewed, using the assumption that the Company would continue to utilize the NEPSI trade name indefinitely. The relief from royalty method was utilized using an 8% royalty rate on revenues with a 13% discount rate over 8 years.

Goodwill represents the value associated with the acquired workforce and expected synergies related to the business combination of the two companies. Goodwill resulting from the NEPSI Acquisition was assigned to the Company’s Grid business segment. Goodwill recognized in the NEPSI Acquisition is not deductible for tax purposes. The $1.7 million of deferred tax liability is primarily related to inventory step up and intangibles.

Note 6 - Goodwill and Other Intangibles - Goodwill (Details) $ in Thousands	6 Months Ended
	Sep. 30, 2022 USD ($)
March 31, 2021	$ 43,471
March 31, 2022	43,471
Grid [Member]
March 31, 2021	34,634
Neeltran Acquisition	8,837
Less impairment loss	0
March 31, 2022	$ 43,471

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References + Details

Unaudited Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Restricted Stock Issued in-Lieu of Cash Bonuses [Member] Common Stock [Member]	Restricted Stock Issued in-Lieu of Cash Bonuses [Member] Additional Paid-in Capital [Member]	Restricted Stock Issued in-Lieu of Cash Bonuses [Member] Treasury Stock [Member]	Restricted Stock Issued in-Lieu of Cash Bonuses [Member] AOCI Attributable to Parent [Member]	Restricted Stock Issued in-Lieu of Cash Bonuses [Member] Retained Earnings [Member]	Restricted Stock Issued in-Lieu of Cash Bonuses [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Mar. 31, 2021							27,988
Balance at Mar. 31, 2021							$ 280	$ 1,121,495	$ (3,593)	$ (277)	$ (1,001,313)	$ 116,592
Issuance of common stock - restricted shares, net of forfeited shares (in shares)							318
Issuance of common stock - restricted shares, net of forfeited shares							$ 3	(3)	0	0	0	0
Stock-based compensation expense							$ 0	1,292	0	0	0	1,292
Issuance of stock for 401(k) match (in shares)							7
Issuance of stock for 401(k) match							$ 0	112	0	0	0	112
Cumulative translation adjustment							0	0	0	(63)	0	(63)
Net loss							$ 0	0	0	0	(5,403)	(5,403)
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total (in shares)	111
Issuance of common stock - bonus payout	$ 1	$ 1,681	$ 0	$ 0	$ 0	$ 1,682
Issuance of common stock - Neeltran acquisition (in shares)							302
Issuance of common stock - Neeltran acquisition							$ 3	4,384	0	0	0	4,387
Repurchase of treasury stock							$ 0	0	(46)	0	0	(46)
Balance (in shares) at Jun. 30, 2021							28,726
Balance at Jun. 30, 2021							$ 287	1,128,961	(3,639)	(340)	(1,006,716)	118,553
Balance (in shares) at Mar. 31, 2021							27,988
Balance at Mar. 31, 2021							$ 280	1,121,495	(3,593)	(277)	(1,001,313)	116,592
Net loss												(9,837)
Balance (in shares) at Sep. 30, 2021							28,793
Balance at Sep. 30, 2021							$ 288	1,130,921	(3,639)	(316)	(1,011,150)	116,104
Balance (in shares) at Jun. 30, 2021							28,726
Balance at Jun. 30, 2021							$ 287	1,128,961	(3,639)	(340)	(1,006,716)	118,553
Stock-based compensation expense							$ 0	1,101	0	0	0	1,101
Issuance of stock for 401(k) match (in shares)							10
Issuance of stock for 401(k) match							$ 0	137	0	0	0	137
Cumulative translation adjustment							0	0	0	24	0	24
Net loss							$ 0	0	0	0	(4,434)	(4,434)
Issuance of common stock - ESPP (in shares)							10
Issuance of common stock - ESPP							$ 0	125	0	0	0	125
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total (in shares)							47
Issuance of common stock - bonus payout							$ 1	597	0	0	0	598
Balance (in shares) at Sep. 30, 2021							28,793
Balance at Sep. 30, 2021							$ 288	1,130,921	(3,639)	(316)	(1,011,150)	116,104
Balance (in shares) at Mar. 31, 2022							28,920
Balance at Mar. 31, 2022							$ 289	1,133,536	(3,639)	(291)	(1,020,506)	109,389
Issuance of common stock - restricted shares, net of forfeited shares (in shares)							(9)
Issuance of common stock - restricted shares, net of forfeited shares							$ 0	0	0	0	0	0
Stock-based compensation expense								1,033				1,033
Issuance of stock for 401(k) match (in shares)							28
Issuance of stock for 401(k) match								138				138
Cumulative translation adjustment										63		63
Net loss											(8,710)	(8,710)
Balance (in shares) at Jun. 30, 2022							28,939
Balance at Jun. 30, 2022							$ 289	1,134,707	(3,639)	(228)	(1,029,216)	101,913
Balance (in shares) at Mar. 31, 2022							28,920
Balance at Mar. 31, 2022							$ 289	1,133,536	(3,639)	(291)	(1,020,506)	109,389
Net loss												(18,590)
Balance (in shares) at Sep. 30, 2022							29,337
Balance at Sep. 30, 2022							$ 293	1,136,028	(3,639)	1,798	(1,039,097)	95,383
Balance (in shares) at Jun. 30, 2022							28,939
Balance at Jun. 30, 2022							$ 289	1,134,707	(3,639)	(228)	(1,029,216)	101,913
Issuance of common stock - restricted shares, net of forfeited shares (in shares)							331
Issuance of common stock - restricted shares, net of forfeited shares							$ 3	(3)	0	0	0	0
Stock-based compensation expense							$ 0	1,019	0	0	0	1,019
Issuance of stock for 401(k) match (in shares)							33
Issuance of stock for 401(k) match							$ 1	178	0	0	0	179
Cumulative translation adjustment							0		0	2,026	0	2,026
Net loss							$ 0		0	0	(9,881)	(9,881)
Issuance of common stock - ESPP (in shares)							34
Issuance of common stock - ESPP							$ 0	127	0	0	0	127
Balance (in shares) at Sep. 30, 2022							29,337
Balance at Sep. 30, 2022							$ 293	$ 1,136,028	$ (3,639)	$ 1,798	$ (1,039,097)	$ 95,383

Note 7 - Fair Value Measurements - Assets and Liabilities Carried at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
Fair value (millions)	$ 1,100	$ 1,400	$ 1,200	$ 2,600	$ 4,700	$ 7,200	$ 7,100
Fair Value, Recurring [Member] \| Reported Value Measurement [Member]
Cash equivalents	9,894		17,641
Fair value (millions)	1,080		1,200
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash equivalents	9,894		17,641
Fair value (millions)	0		0
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Cash equivalents	0		0
Fair value (millions)	0		0
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Cash equivalents	0		0
Fair value (millions)	$ 1,080		$ 1,200

Note 10 - Property, Plant and Equipment (Tables)

6 Months Ended

Sep. 30, 2022

Notes Tables

Property, Plant and Equipment [Table Text Block]

	*September 30, 2022*			*March 31, 2022*
Construction in progress - equipment	$	568		$	573
Land		980			980
Building		5,397			5,270
Equipment and software		43,652			43,668
Finance lease - right of use asset		4			8
Furniture and fixtures		1,521			1,379
Leasehold improvements		6,642			6,634
Property, plant and equipment, gross		58,764			58,512
Less accumulated depreciation		(45,966	)		(44,856	)
Property, plant and equipment, net	$	12,798		$	13,656

Note 15 - Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating lease costs - fixed	$ 262	$ 238	$ 504	$ 469
Operating lease costs - variable	41	32	76	63
Short-term lease costs	30	65	61	131
Total lease costs	$ 333	$ 335	$ 641	$ 663

Note 19 - Subsequent Events

6 Months Ended

Sep. 30, 2022

Notes to Financial Statements

Subsequent Events [Text Block]

19. Subsequent Events

The Company has performed an evaluation of subsequent events through the time of filing this Quarterly Report on Form 10-Q with the SEC and has determined that there are no such events to report.

Note 13 - Contingent Consideration - Summary of the Key Assumptions Used to Calculate Fair Value of Warrants (Details) $ in Millions	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)
Fair value (millions)	$ 1.1	$ 1.4	$ 1.2	$ 2.6	$ 4.7	$ 7.2	$ 7.1
Measurement Input, Revenue Risk Premium [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input	5.20	6.60	6.50	6.60	6.60	6.60	6.70
Measurement Input, Revenue Volatility [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input	25	30	33	33	30	30	30
Measurement Input, Share Price [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input	4.38	5.18	7.61	10.88	14.58	17.39	18.96
Measurement Input, Payment Delay [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input	80	80	80	80	80	80	80

Note 17 - Business Segments - Total Business Segments Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022
Total assets	$ 171,747	$ 173,887
Operating Segments [Member] \| Grid [Member]
Total assets	121,227	114,053
Operating Segments [Member] \| Wind [Member]
Total assets	9,716	9,866
Corporate, Non-Segment [Member]
Total assets	$ 40,804	$ 49,968

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(A))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iv))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124433192&loc=SL2890621-112765

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(i))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(ii))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(5))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iii)(A))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(i))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iii))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(B))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI https://asc.fasb.org/extlink&oid=123419778&loc=d3e5710-111685

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(5))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=116870748&loc=SL6758485-165988

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iv))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(18))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599

+ Details

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net loss	$ (18,590)	$ (9,837)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation and amortization	2,799	2,631
Stock-based compensation expense	2,052	2,393
Provision for excess and obsolete inventory	1,015	1,203
Deferred income taxes	63	(2,137)
Change in fair value of contingent consideration	(120)	(2,330)
China dissolution	1,921	0
Other non-cash items	(134)	197
Unrealized foreign exchange loss on cash and cash equivalents	(3)	1
Changes in operating asset and liability accounts:
Accounts receivable	(92)	(8,657)
Inventory	(13,749)	(475)
Prepaid expenses and other assets	211	1,521
Accounts payable and accrued expenses	6,885	3,475
Deferred revenue	6,170	281
Net cash used in operating activities	(11,572)	(11,734)
Cash flows from investing activities:
Purchase of property, plant and equipment	(560)	(510)
Cash paid for acquisition, net of cash acquired	0	(11,479)
Proceeds from the maturity of marketable securities	0	5,189
Change in other assets	(99)	(30)
Net cash used in investing activities	(659)	(6,830)
Cash flows from financing activities:
Repurchase of treasury stock	0	(46)
Repayment of debt	(33)	(18)
Proceeds from exercise of employee stock options and ESPP	128	125
Net cash provided by financing activities	95	61
Effect of exchange rate changes on cash	4	(47)
Net decrease in cash, cash equivalents and restricted cash	(12,132)	(18,550)
Cash, cash equivalents and restricted cash at beginning of period	49,486	75,539
Cash, cash equivalents and restricted cash at end of period	37,354	56,989
Supplemental schedule of cash flow information:
Cash paid for income taxes, net of refunds	152	306
Non-cash investing and financing activities
Issuance of common stock to settle liabilities	$ 317	$ 2,529

Note 2 - Acquisitions (Details Textual) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended		6 Months Ended		9 Months Ended	12 Months Ended
	May 06, 2021	Mar. 31, 2021	Oct. 01, 2020	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Mar. 31, 2021	Mar. 31, 2020	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021
Payments to Acquire Businesses, Gross						$ (0)	$ 11,479
Cost of Revenue, Total				$ 25,710	$ 24,647	46,169	46,698
Business Combination, Contingent Consideration, Liability, Total		$ 7,100		$ 1,100	$ 4,700	$ 1,100	$ 4,700	$ 2,600	$ 7,100		$ 1,400	$ 1,200	$ 7,200
Northeast Power Systems, Inc (NEPSI) [Member]
Payments to Suppliers										$ 400
Backlog [Member]
Finite-Lived Intangible Asset, Useful Life (Year)						2 years
Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life (Year)						7 years
Neeltran Inc. [Member]
Payments to Acquire Businesses, Gross	$ 4,400
Business Combination, Consideration Transferred, Total	16,400
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory								600
Cost of Revenue, Total								$ 600
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities												2,300
Neeltran Inc. [Member] \| Trademarks and Trade Names [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	$ 1,200											1,200
Neeltran Inc. [Member] \| Trademarks and Trade Names [Member] \| Royalty Rate [Member]
Intangible Assets, Measurement Input (Rate)	1.00%
Neeltran Inc. [Member] \| Trademarks and Trade Names [Member] \| Measurement Input, Discount Rate [Member]
Intangible Assets, Measurement Input (Rate)	24.50%
Neeltran Inc. [Member] \| Trademarks and Trade Names [Member] \| Measurement Input, Expected Term [Member]
Intangible Assets, Measurement Input (Rate)	0.15%
Neeltran Inc. [Member] \| Backlog [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 100											100
Finite-Lived Intangible Asset, Useful Life (Year)	2 years
Neeltran Inc. [Member] \| Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 3,500											$ 3,500
Finite-Lived Intangible Asset, Useful Life (Year)	7 years
Northeast Power Systems, Inc (NEPSI) [Member]
Payments to Acquire Businesses, Gross		26,000	$ 26,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)			873,657
Business Combination, Consideration Transferred, Total		42,400	$ 42,400
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High, Number of Shares (in shares)			1,000,000	1,000,000		1,000,000
Shares Issued, Price Per Share (in dollars per share)			$ 14.23
Business Combination, Contingent Consideration, Liability, Total			$ 4,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities		1,700	1,700						1,700
Northeast Power Systems, Inc (NEPSI) [Member] \| Fair Value Adjustment to Inventory [Member]
Cost of Revenue, Total									1,000
Northeast Power Systems, Inc (NEPSI) [Member] \| Selling, General and Administrative Expenses [Member]
Business Combination, Acquisition Related Costs									300
Northeast Power Systems, Inc (NEPSI) [Member] \| Trademarks and Trade Names [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets			$ 600
Northeast Power Systems, Inc (NEPSI) [Member] \| Trademarks and Trade Names [Member] \| Royalty Rate [Member]
Intangible Assets, Measurement Input (Rate)			8.00%
Northeast Power Systems, Inc (NEPSI) [Member] \| Trademarks and Trade Names [Member] \| Measurement Input, Discount Rate [Member]
Intangible Assets, Measurement Input (Rate)			13.00%
Northeast Power Systems, Inc (NEPSI) [Member] \| Trademarks and Trade Names [Member] \| Measurement Input, Expected Term [Member]
Intangible Assets, Measurement Input (Rate)			0.08%
Northeast Power Systems, Inc (NEPSI) [Member] \| Backlog [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		600	$ 600						600
Finite-Lived Intangible Asset, Useful Life (Year)			2 years
Northeast Power Systems, Inc (NEPSI) [Member] \| Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		$ 6,100	$ 6,100						$ 6,100
Neeltran Third Party Lenders [Member] \| Neeltran Inc. [Member]
Payments to Acquire Businesses, Gross	$ 7,600
Neeltran Third Party Lenders [Member] \| Neeltran Inc. [Member] \| Indebtedness Secured by Mortgage on Real Property [Member]
Payments to Acquire Businesses, Gross	1,900
Neeltran Inc. Sellling Stockholders [Member] \| Neeltran Inc. [Member]
Payments to Acquire Businesses, Gross	$ 1,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)	301,556
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 1
Capanna, Sr. and Capanna, Jr. [Member] \| Neeltran Inc. [Member]
Payments to Acquire Businesses, Gross	$ 1,100
AMSC Husky LLC [Member]
Payments to Acquire Real Estate, Total	4,300
AMSC Husky LLC [Member] \| Owners of Neeltran Headquarters [Member]
Payments to Acquire Real Estate, Total	$ 2,400

Note 2 - Acquisitions - Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022	May 06, 2021	Mar. 31, 2021	Oct. 01, 2020
Goodwill	$ 43,471	$ 43,471
Neeltran Inc. [Member]
Cash and short-term investments		500
Net working capital (excluding inventory and deferred revenue)		(900)
Inventory		9,000
Property, plant and equipment		6,500
Deferred revenue		(10,000)
Deferred tax liability		2,300
Net tangible assets/(liabilities)		2,800
Net identifiable intangible assets/(liabilities)		4,800
Goodwill		8,800
Total purchase consideration		16,400
Net working capital (excluding inventory and deferred revenue)		(900)
Neeltran Inc. [Member] \| Trademarks and Trade Names [Member]
Trade names and trademarks		1,200	$ 1,200
Neeltran Inc. [Member] \| Backlog [Member]
Finite-lived Intangibles Assets		100	100
Neeltran Inc. [Member] \| Customer Relationships [Member]
Finite-lived Intangibles Assets		$ 3,500	$ 3,500
Northeast Power Systems, Inc (NEPSI) [Member]
Net working capital (excluding inventory and deferred revenue)				$ 100
Inventory				4,200
Property, plant and equipment				2,300
Deferred revenue				(2,700)
Deferred tax liability				1,700	$ 1,700
Net tangible assets/(liabilities)				2,200
Net identifiable intangible assets/(liabilities)				7,300
Goodwill				32,900
Total purchase consideration				42,400
Net working capital (excluding inventory and deferred revenue)				100
Northeast Power Systems, Inc (NEPSI) [Member] \| Trademarks and Trade Names [Member]
Trade names and trademarks					600
Northeast Power Systems, Inc (NEPSI) [Member] \| Backlog [Member]
Finite-lived Intangibles Assets				600	600
Northeast Power Systems, Inc (NEPSI) [Member] \| Trade Names [Member]
Trade names and trademarks				600
Northeast Power Systems, Inc (NEPSI) [Member] \| Customer Relationships [Member]
Finite-lived Intangibles Assets				$ 6,100	$ 6,100

Note 12 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Tax Expense (Benefit), Total	$ (14)	$ 181	$ 18	$ (1,947)
Liability for Uncertainty in Income Taxes, Current	0		0
Unrecognized Tax Benefits, Ending Balance	0		0
Neeltran Inc. [Member]
Deferred Tax Liabilities, Other Finite-Lived Assets		$ 2,300		2,300
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount				$ (2,300)
Maximum [Member]
Income Tax Expense (Benefit), Total	$ (100)		$ 100

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Note 9 - Inventory (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Inventory Write-down	$ 700	$ 600	$ 1,015	$ 1,203

Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues	$ 27,680	$ 27,908	$ 50,360	$ 53,328
Grid [Member]
Revenues	25,698	24,619	45,527	48,119
Grid [Member] \| Americas [Member]
Revenues	18,021	18,115	34,923	40,760
Grid [Member] \| Asia Pacific [Member]
Revenues	6,178	3,269	8,855	3,867
Grid [Member] \| EMEA [Member]
Revenues	1,499	3,235	1,749	3,492
Wind [Member]
Revenues	1,982	3,289	4,833	5,209
Wind [Member] \| Americas [Member]
Revenues	0	59	0	78
Wind [Member] \| Asia Pacific [Member]
Revenues	1,912	3,220	4,763	5,091
Wind [Member] \| EMEA [Member]
Revenues	70	10	70	40
Equipment and Systems [Member] \| Grid [Member]
Revenues	24,128	23,031	42,204	44,189
Equipment and Systems [Member] \| Wind [Member]
Revenues	1,330	1,826	3,302	2,860
Services and Technology Development [Member] \| Grid [Member]
Revenues	1,570	1,588	3,323	3,930
Services and Technology Development [Member] \| Wind [Member]
Revenues	$ 652	$ 1,463	$ 1,531	$ 2,349

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130543-203045

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

+ Details

Note 4 - Stock-based Compensation - Weighted Average Assumptions (Details)	6 Months Ended
	Sep. 30, 2022
Expected volatility	71.40%
Risk-free interest rate	3.10%
Expected life (years) (Year)	6 years 1 month 20 days

Note 18 - Recent Accounting Pronouncements

6 Months Ended

Sep. 30, 2022

Notes to Financial Statements

Accounting Standards Update and Change in Accounting Principle [Text Block]

18. Recent Accounting Pronouncements

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The amendments in ASU 2016-13 will provide more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. Following the release of ASU 2019-10 in November 2019, the new effective date, as long as the Company remains a smaller reporting company, would be annual reporting periods beginning after December 15, 2022.The Company evaluated the impact of the adoption of ASU 2016-13, and does not expect it to have a material impact on its consolidated financial statements.

In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. The amendments in ASU 2021-08 will improve the accounting for acquired revenue contracts with customers in a business combination. Following the release of ASU 2021-08 in October 2021, the new effective date will be annual reporting periods beginning after December 15, 2022. The Company is currently evaluating the impact, if any, that the adoption of ASU 2021-08 may have on its consolidated financial statements.

In November 2021, the FASB issued ASU 2021-10, Government Assistance (Topic 832): Disclosures by Business Entities about Government Assistance. The amendments in ASU 2021-10 will improve financial reporting by requiring disclosures that increase the transparency of transactions with government accounted for by applying a grant or contribution accounting model by analogy. Following the release of ASU 2021-10 in November 2021, the new effective date will be annual reporting periods beginning after December 15, 2021. As of April 1, 2022, the Company has adopted ASU 2021-10 and noted no material impact on its consolidated financial statements.

- Definition

The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-URI https://asc.fasb.org/topic&trid=2122394

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 105
-SubTopic 10
-Section 65
-Paragraph 6
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=126987489&loc=SL124442142-165695

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 20
-Section 65
-Paragraph 2
-Subparagraph (d)(1)
-URI https://asc.fasb.org/extlink&oid=126986314&loc=SL124402458-218513

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(iii)
-URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(ii)
-URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(i)
-URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 65
-Paragraph 1
-Subparagraph (e)(1)
-URI https://asc.fasb.org/extlink&oid=126732423&loc=SL123482106-238011

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 20
-Section 65
-Paragraph 2
-Subparagraph (d)(2)
-URI https://asc.fasb.org/extlink&oid=126986314&loc=SL124402458-218513

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(iv)
-URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 11.M.Q2)
-URI https://asc.fasb.org/extlink&oid=122038215&loc=d3e31137-122693

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 10
-Section 65
-Paragraph 4
-Subparagraph (e)(1)
-URI https://asc.fasb.org/extlink&oid=122640432&loc=SL121648383-210437

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (h)(2)
-URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 10
-Section 65
-Paragraph 4
-Subparagraph (e)(2)
-URI https://asc.fasb.org/extlink&oid=122640432&loc=SL121648383-210437

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 848
-SubTopic 10
-Section 65
-Paragraph 1
-Subparagraph (e)(1)
-URI https://asc.fasb.org/extlink&oid=125980421&loc=SL122150809-237846

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 65
-Paragraph 8
-Subparagraph (e)(2)
-URI https://asc.fasb.org/extlink&oid=126983759&loc=SL121830611-158277

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section S99
-Paragraph 6
-URI https://asc.fasb.org/extlink&oid=122038215&loc=SL108384541-122693

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 10
-Section 65
-Paragraph 5
-Subparagraph (f)(1)
-URI https://asc.fasb.org/extlink&oid=128293352&loc=SL126838806-209984

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 65
-Paragraph 6
-Subparagraph (e)(2)
-URI https://asc.fasb.org/extlink&oid=126983955&loc=SL121967933-165497

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (c)(2)
-URI https://asc.fasb.org/extlink&oid=126732423&loc=SL126732908-238011

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 10
-Section 65
-Paragraph 5
-Subparagraph (f)(3)
-URI https://asc.fasb.org/extlink&oid=128293352&loc=SL126838806-209984

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (c)(1)
-URI https://asc.fasb.org/extlink&oid=126732423&loc=SL126732908-238011

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 65
-Paragraph 6
-Subparagraph (e)(1)
-URI https://asc.fasb.org/extlink&oid=126983955&loc=SL121967933-165497

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 65
-Paragraph 8
-Subparagraph (e)(1)
-URI https://asc.fasb.org/extlink&oid=126983759&loc=SL121830611-158277

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (c)(3)
-URI https://asc.fasb.org/extlink&oid=126732423&loc=SL126732908-238011

Reference 26: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 65
-Paragraph 2
-Subparagraph (f)(1)
-URI https://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079

Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 65
-Paragraph 2
-Subparagraph (f)(2)
-URI https://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794

Reference 29: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 65
-Paragraph 2
-Subparagraph (f)(3)
-URI https://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079

Reference 30: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 65
-Paragraph 6
-Subparagraph (e)(3)
-URI https://asc.fasb.org/extlink&oid=126983955&loc=SL121967933-165497

Reference 31: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 848
-SubTopic 10
-Section 65
-Paragraph 2
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=125980421&loc=SL125981372-237846

Reference 32: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794

Reference 33: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794

Reference 34: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 65
-Paragraph 8
-Subparagraph (e)(3)
-URI https://asc.fasb.org/extlink&oid=126983759&loc=SL121830611-158277

+ Details

Note 14 - Debt (Details Textual) $ in Thousands	Sep. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Jun. 30, 2021 USD ($)	May 06, 2021
Debt, Current, Total	$ 72	$ 72
Long-term Debt, Excluding Current Maturities, Total	58	$ 90
Equipment Financing Agreements Assumed In Business Acquisition [Member]
Debt, Current, Total			$ 100
Long-term Debt, Excluding Current Maturities, Total	$ 100
Neeltran Inc. [Member]
Business Combination, Number of Equipment Financing Agreement Assumed				4

Note 13 - Contingent Consideration (Tables)

6 Months Ended

Sep. 30, 2022

Notes Tables

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

	*September 30,*			*June 30,*
Fiscal Year 2022	*2022*			*2022*
Revenue risk premium		5.20	%		6.60	%
Revenue volatility		25	%		30	%
Stock Price	$	4.38		$	5.18
Payment delay (days)		80			80
Fair value (millions)	$	1.1		$	1.4

	*March 31,*			*December 31,*			*September 30,*			*June 30,*			*March 31,*
Fiscal Year 2021	*2022*			*2021*			*2021*			*2021*			*2021*
Revenue risk premium		6.50	%		6.60	%		6.60	%		6.60	%		6.70	%
Revenue volatility		33	%		33	%		30	%		30	%		30	%
Stock Price	$	7.61		$	10.88		$	14.58		$	17.39		$	18.96
Payment delay (days)		80			80			80			80			80
Fair value (millions)	$	1.2		$	2.6		$	4.7		$	7.2		$	7.1

Note 8 - Accounts Receivable

6 Months Ended

Sep. 30, 2022

Notes to Financial Statements

Accounts Receivable [Text Block]

8. Accounts Receivable

Accounts receivable at September 30, 2022 and March 31, 2022 consisted of the following (in thousands):

	*September 30, 2022*		*March 31, 2022*
Accounts receivable (billed)	$	13,879	$	13,788
Accounts receivable (unbilled)		6,512		6,492
Accounts receivable, net	$	20,391	$	20,280

Note 11 - Accounts Payable and Accrued Expenses - Summary of Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022
Accounts payable	$ 18,184	$ 13,192
Accrued inventories in-transit	1,510	2,212
Accrued other miscellaneous expenses	5,370	3,602
Advanced deposits	2,965	3,021
Accrued compensation	5,589	4,642
Income taxes payable	411	405
Accrued product warranty	2,053	2,066
Total	$ 36,082	$ 29,140

Note 7 - Fair Value Measurements

6 Months Ended

Sep. 30, 2022

Notes to Financial Statements

Fair Value Disclosures [Text Block]

7. Fair Value Measurements

A valuation hierarchy for disclosure of the inputs to valuation used to measure fair value has been established. This hierarchy prioritizes the inputs into three broad levels as follows:

Level 1	-	Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.

Level 2	-	Inputs include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs).

Level 3	-	Unobservable inputs that reflect the Company’s assumptions that market participants would use in pricing the asset or liability. The Company develops these inputs based on the best information available, including its own data.

The Company provides a gross presentation of activity within Level 3 measurement roll-forward and details of transfers in and out of Level 1 and 2 measurements. A change in the hierarchy of an investment from its current level is reflected in the period during which the pricing methodology of such investment changes. Disclosure of the transfer of securities from Level 1 to Level 2 or Level 3 is made in the event that the related security is significant to total cash and investments. The Company did not have any transfers of assets and liabilities from Level 1, Level 2 or Level 3 of the fair value measurement hierarchy during the six months ended September 30, 2022.

A financial asset’s or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement.

Valuation Techniques

Cash Equivalents

Cash equivalents consist of highly liquid instruments with maturities of three months or less that are regarded as high quality, low risk investments, are measured using such inputs as quoted prices and are classified within Level 1 of the valuation hierarchy. Cash equivalents consist principally of certificates of deposits and money market accounts.

Marketable Securities

Marketable securities consist of certificates of deposit that are measured using such inputs as quoted prices and are classified within Level 1 of the valuation hierarchy. The Company determines the appropriate classification of its marketable securities at the time of purchase and re-evaluates such classification as of each balance sheet date. All marketable securities are considered available for sale and are carried at fair value. Changes in fair value are recorded to other income (expense), net. The Company had no outstanding marketable securities as of September 30, 2022 and the Company recognized no change in the three and six months ended September 30, 2022. The Company recognized $0.1 million in unrealized losses on marketable securities, which is recorded in other income (expense), net, for the three and six months ended September 30, 2021. The Company periodically reviews the realizability of each short and long term marketable security when impairment indicators exist with respect to the security. If other than temporary impairment of value of the security exists, the carrying value of the security is written down to its estimated fair value.

Contingent Consideration

Contingent consideration relates to the earnout payment set forth in the NEPSI Stock Purchase Agreement that provides that the selling stockholders may receive up to an additional 1,000,000 shares of common stock of the Company upon the achievement of certain specified revenue objectives over varying periods of up to four years following the NEPSI Acquisition Date. See Note 13, "Contingent Consideration" and Note 2, “Acquisitions” for further discussion. The Company relied on a Monte Carlo method to determine the fair value of the contingent consideration on the NEPSI Acquisition Date and will continue to revalue the fair value of the contingent consideration using the same method at each subsequent balance sheet date until the contingencies are resolved and the shares to be issued are determined, with the change in fair value recorded in the current period operating loss.

The following table provides the assets and liabilities carried at fair value on a recurring basis, measured as of September 30, 2022 and March 31, 2022 (in thousands):

	*Total Carrying Value*		*Quoted Prices in Active Markets (Level 1)*		*Significant Other Observable Inputs (Level 2)*		*Significant Unobservable Inputs (Level 3)*
September 30, 2022:
Assets:
Cash equivalents	$	9,894	$	9,894	$	—	$	—
Derivative liabilities:
Contingent consideration	$	1,080	$	—	$	—	$	1,080

	*Total Carrying Value*		*Quoted Prices in Active Markets (Level 1)*		*Significant Other Observable Inputs (Level 2)*		*Significant Unobservable Inputs (Level 3)*
March 31, 2022:
Assets:
Cash equivalents	$	17,641	$	17,641	$	—	$	—
Derivative liabilities:
Contingent consideration	$	1,200	$	—	$	—	$	1,200

The table below reflects the activity for the Company’s derivative liability measured at fair value on a recurring basis (in thousands):

	*Acquisition Contingent Consideration*
Balance at March 31, 2021	$	7,050
Change in fair value		(5,850	)
Balance at March 31, 2022		1,200
Change in fair value		(120	)
Balance at September 30, 2022	$	1,080

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Note 16 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022
Restricted Cash and Cash Equivalents, Noncurrent, Total	$ 5,968	$ 6,148
Restricted Cash and Cash Equivalents, Current, Total	$ 3,600	2,800
Letter of Credit [Member]
Escrow Deposit		$ 5,000

Note 11 - Accounts Payable and Accrued Expenses - Product Warranty Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Balance at beginning of period	$ 1,942	$ 2,187	$ 2,066	$ 2,053
Acquired warranty obligations		0		248
Change in accruals for warranties during the period	479	206	656	314
Settlements during the period	(368)	(238)	(669)	(460)
Balance at end of period	$ 2,053	$ 2,155	$ 2,053	$ 2,155

Note 3 - Revenue Recognition 1 (Details Textual) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue, Performance Obligation Satisfied, Revenue Recognized, Percentage	83.00%		86.00%	77.00%	82.00%
Minimum [Member]
Warranty Period (Year)				1 year
Contract with Customer, Payment Term (Day)				30 days
Maximum [Member]
Warranty Period (Year)				3 years
Extended Service Warranty, Term (Year)		4 years
Contract with Customer, Payment Term (Day)				60 days
Grant [Member]
Revenues, Total			$ 300	$ 0	$ 800

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iv))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iv))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(A))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(i))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(i))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(5))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iii)(A))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(5))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 235
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-05(b)(2))
-URI https://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(B))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 22: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(ii))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(1))
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

+ Details

Note 3 - Revenue Recognition - Revenues by Major Customers (Details) - Revenue Benchmark [Member] - Customer Concentration Risk [Member]	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Inox Wind Limited [Member] \| Wind [Member]
Inox Wind Limited		10.00%
Fuji Bridex Pte Ltd [Member] \| Grid [Member]
Inox Wind Limited	17.00%		13.00%
Tri-state Generation and Transmission Association Inc [Member] \| Grid [Member]
Inox Wind Limited		12.00%
Micron Technology [Member] \| Grid [Member]
Inox Wind Limited				10.00%
Ascend Performance Materials Ops LLC [Member] \| Grid [Member]
Inox Wind Limited	12.00%

Note 15 - Leases (Tables)

6 Months Ended

Sep. 30, 2022

Notes Tables

Assets And Liabilities Lessee [Table Text Block]

	*September 30, 2022*			*March 31, 2022*
Leases:
Right-of-use assets - Financing	$	4			8
Right-of-use assets - Operating		3,274			3,502
Total right-of-use assets		3,278			3,510

Lease liabilities - ST Financing	$	4			7
Lease liabilities - ST Operating		818			740
Lease liabilities - LT Financing		-			1
Lease liabilities - LT Operating		2,572			2,900
Total lease liabilities		3,394			3,648

Weighted-average remaining lease term		4.33			4.93
Weighted-average discount rate		6.37	%		6.36	%

Lease, Cost [Table Text Block]

	*Three Months Ended*		*Six Months Ended*
	*September 30, 2022*		*September 30, 2022*
Operating Leases:
Operating lease costs - fixed	$	262	$	504
Operating lease costs - variable		41		76
Short-term lease costs		30		61
Total lease costs		333		641

	*Three Months Ended*		*Six Months Ended*
	*September 30, 2021*		*September 30, 2021*
Operating Leases:
Operating lease costs - fixed	$	238	$	469
Operating lease costs - variable		32		63
Short-term lease costs		65		131
Total lease costs		335		663

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

	*Leases*
Year ended March 31,
2023	$	506
2024		969
2025		778
2026		719
2027		579
Thereafter		357
Total minimum lease payments		3,908
Less: interest		514
Present value of lease liabilities		3,394

Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues	$ 27,680	$ 27,908	$ 50,360	$ 53,328
Cost of revenues	25,710	24,647	46,169	46,698
Gross margin	1,970	3,261	4,191	6,630
Operating expenses:
Research and development	2,314	2,669	4,992	5,711
Selling, general and administrative	7,350	6,697	14,911	13,838
Amortization of acquisition-related intangibles	688	627	1,369	1,212
Change in fair value of contingent consideration	(290)	(2,430)	(120)	(2,330)
Total operating expenses	10,062	7,563	21,152	18,431
Operating loss	(8,092)	(4,302)	(16,961)	(11,801)
Interest income, net	45	25	70	57
China dissolution	(1,921)	0	(1,921)	0
Other income (expense), net	73	24	240	(40)
Loss before income tax expense	(9,895)	(4,253)	(18,572)	(11,784)
Income tax expense (benefit)	(14)	181	18	(1,947)
Net loss	$ (9,881)	$ (4,434)	$ (18,590)	$ (9,837)
Net loss per common share
Basic (in dollars per share)	$ (0.35)	$ (0.16)	$ (0.67)	$ (0.36)
Diluted (in dollars per share)	$ (0.35)	$ (0.16)	$ (0.67)	$ (0.36)
Weighted average number of common shares outstanding
Basic (in shares)	27,867	27,252	27,714	27,040
Diluted (in shares)	27,867	27,252	27,714	27,040

Note 6 - Goodwill and Other Intangibles - Expected Future Amortization Expense (Details) $ in Thousands	Sep. 30, 2022 USD ($)
2023	$ 1,384
2024	2,158
2025	1,648
2026	1,221
2027	1,085
Thereafter	615
Total	$ 8,111

Note 17 - Business Segments

6 Months Ended

Sep. 30, 2022

Notes to Financial Statements

Segment Reporting Disclosure [Text Block]

17. Business Segments

The Company reports its financial results in two reportable business segments: Grid and Wind.

Through the Company’s power grid offerings, the Grid business segment enables electric utilities, industrial facilities, and renewable energy project developers to connect, transmit and distribute power with exceptional efficiency, reliability, security and affordability through its transmission planning services, power electronics, and superconductor-based systems. The sales process is enabled by transmission planning services that allow it to identify power grid congestion, poor power quality and other risks, which helps the Company determine how its solutions can improve network performance. These services often lead to sales of grid interconnection solutions for wind farms and solar power plants, power quality systems, and transmission and distribution cable systems. The Company also sells ship protection products to the U.S. Navy through its Grid business segment.

Through the Company’s wind power offerings, the Wind business segment enables manufacturers to field wind turbines with exceptional power output, reliability and affordability. The Company provides advanced power electronics and control system products, engineered designs, and support services. The Company supplies advanced power electronics and control systems, licenses its highly engineered wind turbine designs, and provides extensive customer support services to wind turbine manufacturers. The Company’s design portfolio includes a broad range of drivetrains and power ratings of 2 megawatts ("MWs") and higher. The Company provides a broad range of power electronics and software-based control systems that are highly integrated and designed for optimized performance, efficiency, and grid compatibility.

The operating results for the two business segments are as follows (in thousands):

	*Three Months Ended September 30,*				*Six Months Ended September 30,*
	*2022*		*2021*		*2022*		*2021*
Revenues:
Grid	$	25,698	$	24,619	$	45,527	$	48,119
Wind		1,982		3,289		4,833		5,209
Total	$	27,680	$	27,908	$	50,360	$	53,328

	*Three Months Ended September 30,*						*Six Months Ended September 30,*
	*2022*			*2021*			*2022*			*2021*
Operating loss:
Grid	$	(6,495	)	$	(5,836	)	$	(13,776	)	$	(11,180	)
Wind		(868	)		205			(1,254	)		(558	)
Unallocated corporate expenses		(729	)		1,329			(1,931	)		(63	)
Total	$	(8,092	)	$	(4,302	)	$	(16,961	)	$	(11,801	)

The accounting policies of the business segments are the same as those for the consolidated Company. The Company’s business segments have been determined in accordance with the Company’s internal management structure, which is organized based on operating activities. The Company evaluates performance based upon several factors, of which the primary financial measures are segment revenues and segment operating loss. The disaggregated financial results of the segments reflect allocation of certain functional expense categories consistent with the basis and manner in which Company management internally disaggregates financial information for the purpose of assisting in making internal operating decisions. In addition, certain corporate expenses which the Company does not believe are specifically attributable or allocable to either of the two business segments have been excluded from the segment operating loss.

Unallocated corporate expenses consist of a gain on contingent consideration of $0.3 million and $0.1 million in the three and six months ended September 30, 2022. Unallocated corporate expenses consist of a gain on contingent consideration of $2.4 million and $2.3 million in the three and six months ended September 30, 2021. Additionally, unallocated corporate expenses consist of stock-based compensation expense of $1.0 million and $1.1 million in the three months ended September 30, 2022, and 2021, respectively and $2.1 million and $2.4 million in the six months ended September 30, 2022 and 2021, respectively.

Total assets for the two business segments as of September 30, 2022, and March 31, 2022, are as follows (in thousands):

	*September 30, 2022*		*March 31, 2022*
Grid	$	121,227	$	114,053
Wind		9,716		9,866
Corporate assets		40,804		49,968
Total	$	171,747	$	173,887

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8924-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8981-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8721-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 26
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8844-108599

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 15
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8657-108599

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8721-108599

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-URI https://asc.fasb.org/topic&trid=2134510

+ Details

Note 3 - Revenue Recognition 2 (Details Textual) $ in Millions	Sep. 30, 2022 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	12 months
Revenue, Remaining Performance Obligation, Amount	$ 101.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01
Revenue, Remaining Performance Obligation, Amount	$ 18.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01 \| Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	13 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01 \| Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	60 months

Note 10 - Property, Plant and Equipment (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Depreciation, Depletion and Amortization, Total	$ 0.7	$ 0.7	$ 1.4	$ 1.3

Note 3 - Revenue Recognition

6 Months Ended

Sep. 30, 2022

Notes to Financial Statements

Revenue from Contract with Customer [Text Block]

3. Revenue Recognition

The Company’s revenues in its Grid business segment are derived primarily through enabling the transmission and distribution of power, providing planning services that allow it to identify power grid needs and risks, and developing ship protection systems for the U.S. Navy. The Company’s revenues in its Wind business segment are derived primarily through supplying advanced power electronics and control systems, licensing its highly engineered wind turbine designs, and providing extensive customer support services to wind turbine manufacturers. The Company records revenue based on a five-step model in accordance with ASC 606. For its customer contracts, the Company identifies the performance obligations, determines the transaction price, allocates the contract transaction price to the performance obligations, and recognizes the revenue when (or as) control of goods or services is transferred to the customer. In the three and six months ended September 30, 2022, 83% and 77% of revenue, respectively, was recognized at the point in time when control transferred to the customer, with the remainder being recognized over time. In the three and six months ended September 30, 2021, 86% and 82% of revenue, respectively, was recognized at the point in time when control transferred to the customer, with the remainder being recognized over time.

In the Company's equipment and system product line, each contract with a customer summarizes each product sold to a customer, which typically represents distinct performance obligations. A contract's transaction price is allocated to each distinct performance obligation using the respective standalone selling price which is determined primarily using the cost-plus expected margin approach and recognized as revenue when, or as, the performance obligation is satisfied. The majority of the Company’s product sales transfer control to the customer in line with the contracted delivery terms and revenue is recorded at the point in time when title and risk transfer to the customer, which is primarily upon delivery, as the Company has determined that this is the point in time that control transfers to the customer.

The Company's equipment and system product line includes certain contracts which do not meet the requirements of an exchange transaction and therefore do not fall within the scope of ASC 606. As these non-exchange transaction contracts are considered grant revenue and do not fall within any specific accounting literature, the Company follows guidance within ASC 606 by analogy to recognize grant revenue over time. The Company recorded no grant revenue in each of the three and six months ended September 30, 2022. In the three and six months ended September 30, 2021, the Company recorded $0.3 million and $0.8 million in grant revenue, respectively, which is included in the Company’s Grid business segment revenue.

In the Company's service and technology development product line, there are several different types of transactions and each begins with a contract with a customer that summarizes each product sold to a customer, which typically represent distinct performance obligations. The technology development transactions are primarily for activities that have no alternative use and for which a profit can be expected throughout the life of the contract. In these cases, the revenue is recognized over time, but in the instances where a reasonable profit margin cannot be assured throughout the entire contract, the revenue is recognized at a point in time. Each contract's transaction price is allocated to each distinct performance obligation using the respective standalone selling price which is determined primarily using the cost-plus expected margin approach. The ongoing service transactions are for service contracts that provide benefit to the customer simultaneously as the Company performs its obligations, and therefore this revenue is recognized ratably over time throughout the effective period of these contracts. The transaction prices on these contracts are allocated based on an adjusted market approach which is reassessed annually for reasonableness. The field service transactions include contracts for delivery of goods and completion of services made at the customer's requests, which are not deemed satisfied until the work has been completed and/or the requested goods have been delivered, so all of this revenue is recognized at the point in time when the control changes, and at allocated prices based on the adjusted market approach driven by standard price lists. The royalty transactions are related to certain contract terms on transactions in the Company's equipment and systems product line based on activity as specified in the contracts. The transaction prices of these agreements are calculated based on an adjusted market approach as specified in the contract. The Company reports royalty revenue for usage-based royalties when the sales have occurred. In circumstances when collectability is not assured and a contract does not exist under ASC 606, revenue is deferred until a non-refundable payment has been received for substantially all the amount that is due and there are no further remaining performance obligations.

The Company's service contracts can include a purchase order from a customer for specific goods in which each item is a distinct performance obligation satisfied at a point in time at which control of the goods is transferred to the customer. This transfer occurs based on the contracted delivery terms or when the requested service work has been completed. The transaction price for these goods is allocated based on the adjusted market approach considering similar transactions under similar circumstances. Service contracts are also derived from ongoing maintenance contracts and extended service-type warranty contracts. In these transactions, the Company is contracted to provide an ongoing service over a specified period of time. As the customer is consuming the benefits as the service is being provided, the revenue is recognized over time ratably.

The Company’s policy is not to accept volume discounts, product returns, or rebates and allowances within its contracts. In the event a contract was approved with any of these terms, it would be evaluated for variable consideration, estimated and recorded as a reduction of revenue in the same period the related product revenue was recorded.

The Company provides assurance-type warranties on all product sales for a term of typically one to three years, and extended service-type warranties at the customer's option for an additional term ranging up to four additional years. The Company accrues for the estimated warranty costs for assurance warranties at the time of sale based on historical warranty experience plus any known or expected changes in warranty exposure. For all extended service-type warranties, the Company recognizes the revenue ratably over time during the effective period of the services.

The Company records revenue net of sales tax, value added tax, excise tax and other taxes collected concurrent with revenue-producing activities. The Company has elected to recognize the cost for freight and shipping when control over the products sold passes to customers and revenue is recognized. The Company has elected to recognize incremental costs of obtaining a contract as expense when incurred except in contracts where the amortization period would exceed twelve months; in such cases the long-term amount will be assessed for materiality. The Company has elected not to adjust the promised amount of consideration for the effects of a significant financing component if the period of financing is twelve months or less.

The Company’s contracts with customers do not typically include extended payment terms and may include milestone billing over the life of the contract. Payment terms vary by contract type and type of customer and generally range from 30 to 60 days from delivery.

The following tables disaggregate the Company’s revenue by product line and by shipment destination (in thousands):

	*Three Months Ended September 30, 2022*				*Six Months Ended September 30, 2022*
Product Line:	*Grid*		*Wind*		*Grid*		*Wind*
Equipment and systems	$	24,128	$	1,330	$	42,204	$	3,302
Services and technology development		1,570		652		3,323		1,531
Total	$	25,698	$	1,982	$	45,527	$	4,833

Region:
Americas	$	18,021		-	$	34,923	$	-
Asia Pacific		6,178		1,912		8,855		4,763
EMEA		1,499		70		1,749		70
Total	$	25,698	$	1,982	$	45,527	$	4,833

	*Three Months Ended September 30, 2021*				*Six Months Ended September 30, 2021*
Product Line:	*Grid*		*Wind*		*Grid*		*Wind*
Equipment and systems	$	23,031	$	1,826	$	44,189	$	2,860
Services and technology development		1,588		1,463		3,930		2,349
Total	$	24,619	$	3,289	$	48,119	$	5,209

Region:
Americas	$	18,115	$	59	$	40,760	$	78
Asia Pacific		3,269		3,220		3,867		5,091
EMEA		3,235		10		3,492		40
Total	$	24,619	$	3,289	$	48,119	$	5,209

As of September 30, 2022, and 2021, the Company’s contract assets and liabilities primarily relate to the timing differences between cash received from a customer in connection with contractual rights to invoicing and the timing of revenue recognition following completion of performance obligations. The Company's accounts receivable balance is made up entirely of customer contract related balances. Changes in the Company’s contract assets, which are included in “Unbilled accounts receivable” and “Deferred program costs” (see Note 8, “Accounts Receivable” and Note 9, “Inventory” for a reconciliation to the condensed consolidated balance sheets) and "Contract liabilities", which are included in the current portion and long-term portion of "Deferred revenue" in the Company’s condensed consolidated balance sheets, are as follows (in thousands):

	*Unbilled Accounts Receivable*			*Deferred Program Costs*			*Contract Liabilities*
Beginning balance as of March 31, 2022	$	6,492		$	858		$	30,034
Increases for costs incurred to fulfill performance obligations					782
Increase (decrease) due to customer billings		(7,322	)					33,141
Decrease due to cost recognition on completed performance obligations					(697	)
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations		7,342						(26,857	)
Other changes and FX impact					(47	)		(863	)
Ending balance as of September 30, 2022	$	6,512		$	896		$	35,454

	*Unbilled Accounts Receivable*			*Deferred Program Costs*			*Contract Liabilities*
Beginning balance as of March 31, 2021	$	5,765		$	977		$	21,257
Increases for costs incurred to fulfill performance obligations		—			2,277			—
Increase for balance acquired		—			634			10,048
Increase (decrease) due to customer billings		(4,807	)		—			34,344
Decrease due to cost recognition on completed performance obligations		—			(3,055	)		—
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations		7,838			—			(34,169	)
Other changes and FX impact		—			(3	)		38
Ending balance as of September 30, 2021	$	8,796		$	830		$	31,518

The Company’s remaining performance obligations represent the unrecognized revenue value of the Company’s contractual commitments. The Company’s performance obligations may vary significantly each reporting period based on the timing of major new contractual commitments. As of September 30, 2022, the Company had outstanding performance obligations on existing contracts under ASC 606 to be recognized in the next twelve months of approximately $101.0 million. There are also approximately $18.1 million of outstanding performance obligations to be recognized over a period of thirteen to sixty months. The remaining performance obligations are subject to customer actions and therefore the timing of revenue recognition cannot be reasonably estimated. The twelve-month performance obligations include anticipated shipments to Inox based on the twelve-month rolling forecast provided by Inox on the multi-year supply contract. The quantities specified in any forecast provided by Inox related to the multi-year supply contract are firm and irrevocable for the first three months of a twelve-month rolling forecast. The timing of the performance obligations beyond the twelve-month forecast provided by Inox are not determinable and therefore are not included in the total remaining performance obligations.

The following table sets forth customers who represented 10% or more of the Company’s total revenues for the three and six months ended September 30, 2022 and 2021:

Three Months Ended

Six Months Ended

Reportable

September 30,

Segment

2022

2021

2022

2021

Inox Wind Limited

Wind

<10%

Fuji Bridex Pte Ltd

Grid

<10%

Tri-State Generation and Transmission Association, Inc.

Grid

<10%

Micron Technology

Grid

<10%

Ascend Performance Materials Ops LLC

Grid

<10%

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI https://asc.fasb.org/topic&trid=49130388

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130551-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130556-203045

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130554-203045

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 9
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130550-203045

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130554-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130554-203045

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130554-203045

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 15
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130558-203045

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130554-203045

+ Details

Note 2 - Acquisitions - Purchase Price (Details) (Parentheticals) - shares	May 06, 2021	Oct. 01, 2020
Neeltran Inc. [Member] \| Neeltran Inc. Sellling Stockholders [Member]
Issuance of common stock, shares (in shares)	301,556
Northeast Power Systems, Inc (NEPSI) [Member]
Issuance of common stock, shares (in shares)		873,657

Note 2 - Acquisitions (Tables)

6 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Business Acquisitions, by Acquisition [Table Text Block]

Cash payment	$	4.4
Issuance of 301,556 shares of Company's common stock		4.4
Debt payment to third party lenders on behalf of sellers		7.6
Total consideration	$	16.4

Cash payment	$	26.0
Issuance of 873,657 shares of Company’s common stock		12.4
Contingent consideration		4.0
Total consideration	$	42.4

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

Cash and short-term investments	$	0.5
Net working capital (excluding inventory and deferred revenue)		(0.9	)
Inventory		9.0
Property, plant and equipment		6.5
Deferred revenue		(10.0	)
Deferred tax liability		(2.3	)
Net tangible assets/(liabilities)		2.8

Backlog		0.1
Trade names and trademarks		1.2
Customer relationships		3.5
Net identifiable intangible assets/(liabilities)		4.8

Goodwill		8.8

Total purchase consideration	$	16.4

Net working capital (excluding inventory and deferred revenue)	$	0.1
Inventory		4.2
Property, plant and equipment		2.3
Deferred revenue		(2.7	)
Deferred tax liability		(1.7	)
Net tangible assets/(liabilities)		2.2

Backlog		0.6
Trade names and trademarks		0.6
Customer relationships		6.1
Net identifiable intangible assets/(liabilities)		7.3

Goodwill		32.9

Total purchase consideration	$	42.4

Business Acquisition, Pro Forma Information [Table Text Block]

	*Three Months Ended September 30,*						*Six Months Ended September 30,*
	*2022*			*2021*			*2022*			*2021*
Revenues	$	27,680		$	27,908		$	50,360		$	56,158
Operating loss		(8,092	)		(4,302	)		(16,975	)		(11,686	)
Net loss	$	(9,881	)	$	(4,434	)	$	(18,605	)	$	(12,127	)

Net loss per common share
Basic	$	(0.35	)	$	(0.16	)	$	(0.67	)	$	(0.45	)
Diluted	$	(0.35	)	$	(0.16	)	$	(0.67	)	$	(0.45	)
Shares - basic		27,867			27,252			27,714			27,101
Shares - diluted		27,867			27,252			27,714			27,101

Note 6 - Goodwill and Other Intangibles - Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2022	Mar. 31, 2022
Accumulated Amortization	$ (11,750)	$ (10,350)
Net Book Value	8,111
Intangible assets, gross amount	21,661	21,661
Intangible assets, net	9,911	11,311
Trade Names [Member]
Trade name and trademarks	1,800	1,800
Licensing Agreements [Member]
Gross Amount	3,610	3,610
Accumulated Amortization	(3,610)	(3,610)
Net Book Value	$ 0	0
Estimated Useful Life (Year)	7 years
Backlog [Member]
Gross Amount	$ 681	681
Accumulated Amortization	(668)	(631)
Net Book Value	$ 13	50
Estimated Useful Life (Year)	2 years
Customer Relationships [Member]
Gross Amount	$ 9,600	9,600
Accumulated Amortization	(3,845)	(2,723)
Net Book Value	$ 5,755	6,877
Estimated Useful Life (Year)	7 years
Core Technology and Know-how [Member]
Gross Amount	$ 5,970	5,970
Accumulated Amortization	(3,627)	(3,386)
Net Book Value	$ 2,343	$ 2,584
Core Technology and Know-how [Member] \| Minimum [Member]
Estimated Useful Life (Year)	5 years
Core Technology and Know-how [Member] \| Maximum [Member]
Estimated Useful Life (Year)	10 years

Note 15 - Leases

6 Months Ended

Sep. 30, 2022

Notes to Financial Statements

Lessee, Operating Leases [Text Block]

15. Leases

The Company determines whether a contract is or contains a lease at inception of a contract. The Company defines a lease as a contract, or part of a contract, that conveys the right to control the use of identified property or equipment (an identified asset) for a period of time in exchange for consideration. Control over the use of the identified asset means that the Company has both the right to obtain substantially all of the economic benefits from the use of the asset and the right to direct the use of the asset.

The discount rate was calculated using an incremental borrowing rate based on an assessment prepared by the Company through the use of Company credit ratings, consideration of its lease populations potential risk to its total capital structure, and a market rate for a collateralized loan for its risk profile, calculated by a third party. The Company elected to apply the discount rate using the remaining lease term at the date of adoption for Neeltran lease contracts.

Following the Neeltran Acquisition, the Company evaluated all open Neeltran contracts at the date of the acquisition to determine if any applied under ASC 842 as Neeltran, a private company, had deferred adopting ASC 842 prior to the Neeltran Acquisition, as permitted. The Company identified nine lease contracts with terms greater than twelve months and evaluated them under ASC 842 guidance. As part of the implementation, the Company identified one lease contract that classified as a financing lease. The Company does not expect a material impact to the financial statements on an ongoing basis resulting from the adoption of the ASC 842 standard for the Neeltran business and Neeltran will follow the existing policies below.

Operating Leases

All significant lease arrangements are recognized at lease commencement. Operating lease right–of-use assets and lease liabilities are recognized at commencement. The operating lease right-of-use asset includes any lease payments related to initial direct cost and prepayments and excludes any lease incentives. Lease expense is recognized on a straight-line basis over the lease term. The Company enters into a variety of operating lease agreements through the normal course of its business, but primarily real estate leases to support its operations. The real estate lease agreements generally provide for fixed minimum rental payments and the payment of real estate taxes and insurance. Many of these real estate leases have one or more renewal options that allow the Company, at its discretion, to renew the lease for varying periods up to five years or to terminate the lease. Only renewal options or termination rights that the Company believed were likely to be exercised were included in the lease calculations.

The Company also enters into leases for vehicles, IT equipment and service agreements, and other leases related to its manufacturing operations that are also included in the right-of-use assets and lease liability accounts if they are for a term of longer than twelve months. However, many of these leases are either short-term in nature or immaterial. The Company has made the policy election to exclude short-term leases from the balance sheet.

Finance Leases

As part of the adoption of ASC 842 at Neeltran, the Company identified one lease contract that is classified as a finance lease. In February 2020, Neeltran entered into a contract to lease a copy machine for an initial term of 39 months, or through May 2023. The Company concluded that the lease should be classified and accounted for as a finance lease as the total value of the lease payments are greater than fair value of the asset. Accordingly, on May 6, 2021, the Company recognized a finance lease right-of-use asset and a finance lease liability of $13.2 thousand on the Neeltran opening balance sheet. As of September 30, 2022, the right-of-use asset related to the finance lease was $4.2 thousand, net of accumulated amortization of $9.0 thousand, and is included in the property and equipment, net on the Company's consolidated balance sheet.

Finance lease right-of-use assets and lease liabilities are recognized similar to an operating lease, at the lease commencement date or the date the lessor makes the leased asset available for use. Finance lease right-of-use assets are generally amortized on a straight-line basis over the lease term, and the carrying amount of the finance lease liabilities are (1) accreted to reflect interest using the incremental borrowing rate if the rate implicit in the lease is not readily determinable, and (2) reduced to reflect lease payments made during the period. Amortization expense for finance lease right-of-use assets and interest accretion on finance lease liabilities are recorded to depreciation expense and interest expense, respectively in the Company's consolidated statement of operations.

Supplemental balance sheet information related to leases at September 30, 2022, and March 31, 2022 are as follows (in thousands):

	*September 30, 2022*			*March 31, 2022*
Leases:
Right-of-use assets - Financing	$	4			8
Right-of-use assets - Operating		3,274			3,502
Total right-of-use assets		3,278			3,510

Lease liabilities - ST Financing	$	4			7
Lease liabilities - ST Operating		818			740
Lease liabilities - LT Financing		-			1
Lease liabilities - LT Operating		2,572			2,900
Total lease liabilities		3,394			3,648

Weighted-average remaining lease term		4.33			4.93
Weighted-average discount rate		6.37	%		6.36	%

The costs related to the Company's finance lease are not material. The costs related to the Company's operating leases for the three and six months ended September 30, 2022 and 2021 are as follows (in thousands):

	*Three Months Ended*		*Six Months Ended*
	*September 30, 2022*		*September 30, 2022*
Operating Leases:
Operating lease costs - fixed	$	262	$	504
Operating lease costs - variable		41		76
Short-term lease costs		30		61
Total lease costs		333		641

	*Three Months Ended*		*Six Months Ended*
	*September 30, 2021*		*September 30, 2021*
Operating Leases:
Operating lease costs - fixed	$	238	$	469
Operating lease costs - variable		32		63
Short-term lease costs		65		131
Total lease costs		335		663

The Company’s estimated minimum future lease obligations under the Company's leases are as follows (in thousands):

	*Leases*
Year ended March 31,
2023	$	506
2024		969
2025		778
2026		719
2027		579
Thereafter		357
Total minimum lease payments		3,908
Less: interest		514
Present value of lease liabilities		3,394

Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022
Current assets:
Cash and cash equivalents	$ 27,811	$ 40,584
Accounts receivable, net	20,391	20,280
Inventory, net	36,342	23,666
Prepaid expenses and other current assets	6,861	7,052
Restricted cash	3,574	2,754
Total current assets	94,979	94,336
Property, plant and equipment, net	12,798	13,656
Intangibles, net	9,911	11,311
Right-of-use assets	3,274	3,502
Goodwill	43,471	43,471
Restricted cash	5,968	6,148
Deferred tax assets	1,023	1,224
Other assets	323	239
Total assets	171,747	173,887
Current liabilities:
Accounts payable and accrued expenses	36,082	29,140
Lease liability, current portion	822	740
Debt, current portion	72	72
Contingent consideration	1,080	1,200
Deferred revenue, current portion	28,824	22,812
Total current liabilities	66,880	53,964
Deferred revenue, long-term portion	6,630	7,222
Lease liability, long-term portion	2,572	2,900
Deferred tax liabilities	203	297
Debt, long-term portion	58	90
Other liabilities	21	25
Total liabilities	76,364	64,498
Commitments and Contingencies (Note 16)
Stockholders' equity:
Common stock	293	289
Additional paid-in capital	1,136,028	1,133,536
Treasury stock	(3,639)	(3,639)
Accumulated other comprehensive income (loss)	1,798	(291)
Accumulated deficit	(1,039,097)	(1,020,506)
Total stockholders' equity	95,383	109,389
Total liabilities and stockholders' equity	$ 171,747	$ 173,887

Note 8 - Accounts Receivable (Tables)

6 Months Ended

Sep. 30, 2022

Notes Tables

Accounts Receivable [Table Text Block]

	*September 30, 2022*		*March 31, 2022*
Accounts receivable (billed)	$	13,879	$	13,788
Accounts receivable (unbilled)		6,512		6,492
Accounts receivable, net	$	20,391	$	20,280

Note 9 - Inventory

6 Months Ended

Sep. 30, 2022

Notes to Financial Statements

Inventory Disclosure [Text Block]

9. Inventory

Inventory, net of reserves, at September 30, 2022 and March 31, 2022 consisted of the following (in thousands):

	*September 30, 2022*		*March 31, 2022*
Raw materials	$	17,601	$	11,020
Work-in-process		14,591		10,462
Finished goods		3,254		1,326
Deferred program costs		896		858
Net inventory	$	36,342	$	23,666

The Company recorded inventory write-downs of $0.7 million and $0.6 million for the three months ended September 30, 2022 and 2021, respectively. The Company recorded inventory write-downs of $1.0 million and $1.2 million for the six months ended September 30, 2022 and 2021, respectively. These write-downs were based on the Company's evaluation of its inventory on hand for excess quantities and obsolescence.

Deferred program costs as of September 30, 2022 and March 31, 2022, primarily represent costs incurred on programs where the Company needs to complete performance obligations before the related revenue and costs will be recognized.

Note 6 - Goodwill and Other Intangibles (Tables)

6 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Goodwill [Table Text Block]

	*Goodwill*
March 31, 2021	$	34,634
Neeltran Acquisition		8,837
March 31, 2022	$	43,471
Less impairment loss		-
September 30, 2022	$	43,471

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	September 30, 2022							March 31, 2022
	Gross Amount		Accumulated Amortization			Net Book Value		Gross Amount		Accumulated Amortization			Net Book Value		Estimated Useful Life
Licenses	$	3,610	$	(3,610	)		—	$	3,610	$	(3,610	)		—		7
Backlog	$	681	$	(668	)	$	13	$	681	$	(631	)	$	50		2
Trade name and trademarks		1,800		—			1,800		1,800		—			1,800	Indefinite
Customer relationships		9,600		(3,845	)		5,755		9,600		(2,723	)		6,877		7
Core technology and know-how		5,970		(3,627	)		2,343		5,970		(3,386	)		2,584		5-10
Intangible assets	$	21,661	$	(11,750	)	$	9,911	$	21,661	$	(10,350	)	$	11,311

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Years ended March 31,	*Total*
2023		1,384
2024		2,158
2025		1,648
2026		1,221
2027		1,085
Thereafter		615
Total	$	8,111

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1A
-URI https://asc.fasb.org/extlink&oid=121556970&loc=SL108378252-109267

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267

Reference 11: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 55
-Paragraph 24
-URI https://asc.fasb.org/extlink&oid=122137925&loc=d3e14258-109268

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

+ Details

Note 10 - Property, Plant and Equipment

6 Months Ended

Sep. 30, 2022

Notes to Financial Statements

Property, Plant and Equipment Disclosure [Text Block]

10. Property, Plant and Equipment

The cost and accumulated depreciation of property, plant and equipment at September 30, 2022 and March 31, 2022 are as follows (in thousands):

	*September 30, 2022*			*March 31, 2022*
Construction in progress - equipment	$	568		$	573
Land		980			980
Building		5,397			5,270
Equipment and software		43,652			43,668
Finance lease - right of use asset		4			8
Furniture and fixtures		1,521			1,379
Leasehold improvements		6,642			6,634
Property, plant and equipment, gross		58,764			58,512
Less accumulated depreciation		(45,966	)		(44,856	)
Property, plant and equipment, net	$	12,798		$	13,656

Depreciation expense was $0.7 million for each of the three months ended September 30, 2022 and 2021, respectively. Depreciation expense was $1.4 million and $1.3 million for the six months ended September 30, 2022 and 2021, respectively.

Note 13 - Contingent Consideration

6 Months Ended

Sep. 30, 2022

Notes to Financial Statements

Business Combination, Contingent Consideration [Text Block]

13. Contingent Consideration

Contingent Consideration

The Company evaluated the NEPSI Acquisition earnout payment set forth in the NEPSI Stock Purchase Agreement (see Note 2, "Acquisitions" for further details), which may require settlement in the Company's common stock, and determined the contingent consideration qualified for liability classification and derivative treatment under ASC 815, Derivatives and Hedging. As a result, for each period, the fair value of the contingent consideration will be remeasured and the resulting gain or loss will be recognized in operating expenses until the share amount is fixed.

Following is a summary of the key assumptions used in a Monte Carlo simulation to calculate the fair value of the contingent consideration related to the NEPSI Acquisition:

	*September 30,*			*June 30,*
Fiscal Year 2022	*2022*			*2022*
Revenue risk premium		5.20	%		6.60	%
Revenue volatility		25	%		30	%
Stock Price	$	4.38		$	5.18
Payment delay (days)		80			80
Fair value (millions)	$	1.1		$	1.4

	*March 31,*			*December 31,*			*September 30,*			*June 30,*			*March 31,*
Fiscal Year 2021	*2022*			*2021*			*2021*			*2021*			*2021*
Revenue risk premium		6.50	%		6.60	%		6.60	%		6.60	%		6.70	%
Revenue volatility		33	%		33	%		30	%		30	%		30	%
Stock Price	$	7.61		$	10.88		$	14.58		$	17.39		$	18.96
Payment delay (days)		80			80			80			80			80
Fair value (millions)	$	1.2		$	2.6		$	4.7		$	7.2		$	7.1

The Company recorded a net gain of $0.3 and $0.1 million resulting from the decrease in the fair value of the contingent consideration in the three and six months ended September 30, 2022. The Company recorded a net gain of $2.4 million and $2.3 million resulting from the decrease in the fair value of the contingent consideration in the three and six months ended September 30, 2021, respectively.

Note 15 - Leases (Details Textual) - USD ($)	Sep. 30, 2022	Mar. 31, 2022	May 06, 2021	Feb. 29, 2020
Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total	$ 4,200	$ 8,000
Finance Lease, Right-of-Use Asset, Accumulated Amortization	$ 9,000.0
Neeltran Inc. [Member]
Lessee, Finance Lease, Term of Contract (Month)				39 months
Neeltran Inc. [Member] \| Property and Equipment, Net [Member]
Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total			$ 13,200
Maximum [Member]
Lessee, Operating Lease, Renewal Term (Year)	5 years

Note 9 - Inventory - Summary of Net Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022
Raw materials	$ 17,601	$ 11,020
Work-in-process	14,591	10,462
Finished goods	3,254	1,326
Deferred program costs	896	858
Net inventory	$ 36,342	$ 23,666

Note 2 - Acquisitions - Unaudited Pro Forma Operating Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues	$ 27,680	$ 27,908	$ 50,360	$ 56,158
Operating loss	(8,092)	(4,302)	(16,975)	(11,686)
Net loss	$ (9,881)	$ (4,434)	$ (18,605)	$ (12,127)
Basic (in dollars per share)	$ (0.35)	$ (0.16)	$ (0.67)	$ (0.45)
Diluted (in dollars per share)	$ (0.35)	$ (0.16)	$ (0.67)	$ (0.45)
Shares - basic (in shares)	27,867	27,252	27,714	27,101
Shares - diluted (in shares)	27,867	27,252	27,714	27,101

Unaudited Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net loss	$ (9,881)	$ (4,434)	$ (18,590)	$ (9,837)
Other comprehensive (loss) gain, net of tax:
China dissolution	1,921	0	1,921	0
Foreign currency translation (loss) gain	105	24	168	(39)
Comprehensive loss	$ (7,855)	$ (4,410)	$ (16,501)	$ (9,876)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Note 3 - Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Unbilled AR, beginning balance	$ 6,492	$ 5,765
Deferred Program Costs, beginning balance	858	977
Contract Liabilities, beginning balance	30,034	21,257
Deferred Program Costs, increases for costs incurred to fulfill performance obligations	782	2,277
Unbilled AR, increase (decrease) due to customer billings	(7,322)	(4,807)
Increase (decrease) due to customer billings	33,141	34,344
Deferred Program Costs, decrease due to cost recognition on completed performance obligations	(697)	(3,055)
Unbilled AR, increase (decrease) due to recognition of revenue based on transfer of control of performance obligations	7,342	7,838
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations	(26,857)	(34,169)
Deferred Program Costs, other changes and FX impact	(47)	(3)
Other changes and FX impact	(863)	38
Increase for balance acquired		634
Increase for balance acquired		10,048
Unbilled AR, ending balance	6,512	8,796
Deferred Program Costs, ending balance	896	830
Contract Liabilities, ending balance	$ 35,454	$ 31,518

Note 6 - Goodwill and Other Intangibles (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Customer Relationship, Core Technology and Know-how [Member]
Amortization of Intangible Assets	$ 700	$ 600	$ 1,400	$ 1,200
Backlog [Member]
Amortization of Intangible Assets	$ 0	$ 100	$ 100	$ 100

Note 17 - Business Segments (Tables)

6 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	*Three Months Ended September 30,*				*Six Months Ended September 30,*
	*2022*		*2021*		*2022*		*2021*
Revenues:
Grid	$	25,698	$	24,619	$	45,527	$	48,119
Wind		1,982		3,289		4,833		5,209
Total	$	27,680	$	27,908	$	50,360	$	53,328

	*Three Months Ended September 30,*						*Six Months Ended September 30,*
	*2022*			*2021*			*2022*			*2021*
Operating loss:
Grid	$	(6,495	)	$	(5,836	)	$	(13,776	)	$	(11,180	)
Wind		(868	)		205			(1,254	)		(558	)
Unallocated corporate expenses		(729	)		1,329			(1,931	)		(63	)
Total	$	(8,092	)	$	(4,302	)	$	(16,961	)	$	(11,801	)

Reconciliation of Assets from Segment to Consolidated [Table Text Block]

	*September 30, 2022*		*March 31, 2022*
Grid	$	121,227	$	114,053
Wind		9,716		9,866
Corporate assets		40,804		49,968
Total	$	171,747	$	173,887

Note 7 - Fair Value Measurements (Tables)

6 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	*Total Carrying Value*		*Quoted Prices in Active Markets (Level 1)*		*Significant Other Observable Inputs (Level 2)*		*Significant Unobservable Inputs (Level 3)*
September 30, 2022:
Assets:
Cash equivalents	$	9,894	$	9,894	$	—	$	—
Derivative liabilities:
Contingent consideration	$	1,080	$	—	$	—	$	1,080

	*Total Carrying Value*		*Quoted Prices in Active Markets (Level 1)*		*Significant Other Observable Inputs (Level 2)*		*Significant Unobservable Inputs (Level 3)*
March 31, 2022:
Assets:
Cash equivalents	$	17,641	$	17,641	$	—	$	—
Derivative liabilities:
Contingent consideration	$	1,200	$	—	$	—	$	1,200

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

	*Acquisition Contingent Consideration*
Balance at March 31, 2021	$	7,050
Change in fair value		(5,850	)
Balance at March 31, 2022		1,200
Change in fair value		(120	)
Balance at September 30, 2022	$	1,080

Note 16 - Commitments and Contingencies

6 Months Ended

Sep. 30, 2022

Notes to Financial Statements

Commitments and Contingencies Disclosure [Text Block]

16. Commitments and Contingencies

Legal Contingencies

From time to time, the Company is involved in legal and administrative proceedings and claims of various types. The Company records a liability in its consolidated financial statements for these matters when a loss is known or considered probable and the amount can be reasonably estimated. The Company reviews these estimates each accounting period as additional information is known and adjusts the loss provision when appropriate. If a matter is both probable to result in a liability and the amounts of loss can be reasonably estimated, the Company estimates and discloses the possible loss or range of loss to the extent necessary to make the consolidated financial statements not misleading. If the loss is not probable or cannot be reasonably estimated, a liability is not recorded in its consolidated financial statements.

Other

The Company enters into long-term construction contracts with customers that require the Company to obtain performance bonds. The Company is required to deposit an amount equivalent to some or all the face amount of the performance bonds into an escrow account until the termination of the bond. When the performance conditions are met, amounts deposited as collateral for the performance bonds are returned to the Company. In addition, the Company has various contractual arrangements in which minimum quantities of goods or services have been committed to be purchased on an annual basis.

As of September 30, 2022, the Company had $6.0 million of restricted cash included in long-term assets and $3.6 million of restricted cash included in current assets. As of March 31, 2022, the Company had $6.1 million of restricted cash included in long term assets and $2.8 million of restricted cash included in current assets. These amounts included in restricted cash primarily represent deposits to secure letters of credit for various supply contracts and long-term projects, including the irrevocable letter of credit in the amount of $5.0 million to secure certain of the Company's obligations under a subcontract agreement with ComEd. These deposits are held in interest bearing accounts.

Note 6 - Goodwill and Other Intangibles

6 Months Ended

Sep. 30, 2022

Notes to Financial Statements

Goodwill and Intangible Assets Disclosure [Text Block]

6. Goodwill and Other Intangibles

Goodwill

Goodwill represents the difference between the purchase price and the fair value of the identifiable tangible and intangible net assets when accounted for using the purchase method of accounting. The Company's goodwill balance relates to the Neeltran Acquisition in fiscal 2021, the NEPSI Acquisition in fiscal 2020, and the acquisition of Infinia Technology Corporation in fiscal 2017 and is reported in the Grid business segment. Goodwill is not amortized but reviewed for impairment. Goodwill is reviewed annually and whenever events or changes in circumstances indicate that the carrying value of the goodwill might not be recoverable.

The following table provides a roll forward of the changes in the Company's Grid business segment goodwill balance:

	*Goodwill*
March 31, 2021	$	34,634
Neeltran Acquisition		8,837
March 31, 2022	$	43,471
Less impairment loss		-
September 30, 2022	$	43,471

The Company did not identify any triggering events in the three and six months ended September 30, 2022 that would require interim impairment testing of goodwill.

Other Intangibles

Intangible assets at September 30, 2022 and March 31, 2022 consisted of the following (in thousands):

	September 30, 2022							March 31, 2022
	Gross Amount		Accumulated Amortization			Net Book Value		Gross Amount		Accumulated Amortization			Net Book Value		Estimated Useful Life
Licenses	$	3,610	$	(3,610	)		—	$	3,610	$	(3,610	)		—		7
Backlog	$	681	$	(668	)	$	13	$	681	$	(631	)	$	50		2
Trade name and trademarks		1,800		—			1,800		1,800		—			1,800	Indefinite
Customer relationships		9,600		(3,845	)		5,755		9,600		(2,723	)		6,877		7
Core technology and know-how		5,970		(3,627	)		2,343		5,970		(3,386	)		2,584		5-10
Intangible assets	$	21,661	$	(11,750	)	$	9,911	$	21,661	$	(10,350	)	$	11,311

The Company recorded intangible amortization expense related to customer relationship and core technology and know-how of $0.7 million and $1.4 million, in the three and six months ended September 30, 2022, respectively, and $0.6 million and $1.2 million in the three and six months ended September 30, 2021, respectively. Additionally, the Company recorded no intangible amortization related to backlog in the three months ended September 30, 2022 and the Company recorded less than $0.1 million related to backlog that is reported in cost of revenues in the six months ended September 30, 2022. The Company recorded intangible amortization related to backlog that is reported in cost of revenues of less than $0.1 million and $0.1 million in the three and six months ended September 30, 2021, respectively.

Expected future amortization expense related to intangible assets is as follows (in thousands):

Years ended March 31,	*Total*
2023		1,384
2024		2,158
2025		1,648
2026		1,221
2027		1,085
Thereafter		615
Total	$	8,111

The Company's intangible assets relate entirely to the Grid business segment operations in the United States.

Note 17 - Business Segments - Operating Results for Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues	$ 27,680	$ 27,908	$ 50,360	$ 53,328
Operating Income (loss)	(8,092)	(4,302)	(16,961)	(11,801)
Corporate, Non-Segment [Member]
Operating Income (loss)	(729)	1,329	(1,931)	(63)
Grid [Member]
Revenues	25,698	24,619	45,527	48,119
Grid [Member] \| Operating Segments [Member]
Operating Income (loss)	(6,495)	(5,836)	(13,776)	(11,180)
Wind [Member]
Revenues	1,982	3,289	4,833	5,209
Wind [Member] \| Operating Segments [Member]
Operating Income (loss)	$ (868)	$ 205	$ (1,254)	$ (558)

- Definition

+ References

+ Details

Note 5 - Computation of Net Loss Per Common Share (Tables)

6 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	*Three Months Ended September 30,*						*Six Months Ended September 30,*
	*2022*			*2021*			*2022*			*2021*
Numerator:
Net loss	$	(9,881	)	$	(4,434	)	$	(18,590	)	$	(9,837	)
Denominator:
Weighted-average shares of common stock outstanding		28,775			28,360			28,648			28,141
Weighted-average shares subject to repurchase		(908	)		(1,108	)		(934	)		(1,101	)
Shares used in per-share calculation ― basic		27,867			27,252			27,714			27,040
Shares used in per-share calculation ― diluted		27,867			27,252			27,714			27,040
Net loss per share ― basic	$	(0.35	)	$	(0.16	)	$	(0.67	)	$	(0.36	)
Net loss per share ― diluted	$	(0.35	)	$	(0.16	)	$	(0.67	)	$	(0.36	)

Note 8 - Accounts Receivable - Summary of Accounts Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022
Accounts receivable (billed)	$ 13,879	$ 13,788
Accounts receivable (unbilled)	6,512	6,492
Accounts receivable, net	$ 20,391	$ 20,280