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Document And Entity Information - shares	3 Months Ended
Document And Entity Information - shares	Jun. 30, 2020	Jul. 31, 2020
Document Information [Line Items]
Entity Registrant Name	AMERICAN SUPERCONDUCTOR CORP /DE/
Entity Central Index Key	0000880807
Trading Symbol	amsc
Current Fiscal Year End Date	--03-31
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Interactive Data Current	Yes
Entity Common Stock, Shares Outstanding (in shares)		23,035,017
Entity Shell Company	false
Document Type	10-Q
Document Period End Date	Jun. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false
Title of 12(b) Security	Common Stock, par value $0.01 per share

Unaduited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020
Current assets:
Cash and cash equivalents	$ 20,709	$ 24,699
Marketable securities	30,260	30,149
Accounts receivable, net	8,203	16,987
Inventory	17,061	18,975
Prepaid expenses and other current assets	3,615	2,959
Restricted cash	508	508
Total current assets	80,356	94,277
Marketable securities	5,070	5,046
Property, plant and equipment, net	8,331	8,565
Intangibles, net	3,429	3,550
Right-of-use assets	3,264	3,359
Goodwill	1,719	1,719
Restricted cash	5,659	5,657
Deferred tax assets	1,580	1,551
Other assets	262	385
Total assets	109,670	124,109
Current liabilities:
Accounts payable and accrued expenses	14,265	22,091
Lease liability, current portion	444	439
Deferred revenue, current portion	14,724	18,430
Total current liabilities	29,433	40,960
Deferred revenue, long term portion	7,661	7,712
Lease liability, long term portion	2,891	3,000
Deferred tax liabilities	231	180
Other liabilities	35	38
Total liabilities	40,251	51,890
Commitments and Contingencies (Note 14)
Stockholders' equity:
Common stock	234	229
Additional paid-in capital	1,054,499	1,053,507
Treasury stock	(3,043)	(2,666)
Accumulated other comprehensive loss	(219)	(216)
Accumulated deficit	(982,052)	(978,635)
Total stockholders' equity	69,419	72,219
Total liabilities and stockholders' equity	$ 109,670	$ 124,109

Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Revenues	$ 21,213	$ 13,770
Cost of revenues	16,173	12,193
Gross margin	5,040	1,577
Operating expenses:
Research and development	2,499	2,473
Selling, general and administrative	5,637	5,255
Amortization of acquisition-related intangibles	121	85
Total operating expenses	8,257	7,813
Operating loss	(3,217)	(6,236)
Change in fair value of warrants		2,946
Interest income, net	158	505
Other expense, net	(170)	(543)
Loss before income tax expense	(3,229)	(3,328)
Income tax expense	188	211
Net loss	$ (3,417)	$ (3,539)
Net loss per common share
Basic (in dollars per share)	$ (0.16)	$ (0.17)
Diluted (in dollars per share)	$ (0.16)	$ (0.17)
Weighted average number of common shares outstanding
Basic (in shares)	21,689	20,514
Diluted (in shares)	21,689	20,514

Unaudited Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Net loss	$ (3,417)	$ (3,539)
Other comprehensive (loss) income, net of tax:
Foreign currency translation (loss) gain	(3)	418
Total other comprehensive (loss) income, net of tax	(3)	418
Comprehensive loss	$ (3,420)	$ (3,121)

- Definition

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

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+ Details

Unaudited Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	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, 2019	21,652
Balance at Mar. 31, 2019	$ 216	$ 1,044,622	$ (2,101)	$ (5)	$ (961,539)	$ 81,193
Issuance of common stock - restricted shares (in shares)	174
Issuance of common stock - restricted shares	$ 2	(2)
Stock-based compensation expense		249				249
Issuance of stock for 401(k) match (in shares)	8
Issuance of stock for 401(k) match		81				81
Repurchase of treasury stock			(283)			(283)
Cumulative translation adjustment				418		418
Net loss					(3,539)	(3,539)
Issuance of common stock - warrant exercise (in shares)	23
Issuance of common stock - warrant exercise		294				294
Balance (in shares) at Jun. 30, 2019	21,857
Balance at Jun. 30, 2019	$ 218	1,045,244	(2,384)	413	(965,078)	78,413
Balance (in shares) at Mar. 31, 2020	22,902
Balance at Mar. 31, 2020	$ 229	1,053,507	(2,666)	(216)	(978,635)	72,219
Issuance of common stock - restricted shares (in shares)	493
Issuance of common stock - restricted shares	$ 5	(5)
Stock-based compensation expense		909				909
Issuance of stock for 401(k) match (in shares)	13
Issuance of stock for 401(k) match		88				88
Repurchase of treasury stock			(377)			(377)
Cumulative translation adjustment				(3)		(3)
Net loss					(3,417)	(3,417)
Balance (in shares) at Jun. 30, 2020	23,408
Balance at Jun. 30, 2020	$ 234	$ 1,054,499	$ (3,043)	$ (219)	$ (982,052)	$ 69,419

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (3,417)	$ (3,539)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation and amortization	1,000	1,149
Stock-based compensation expense	909	249
Provision for excess and obsolete inventory	789	89
Change in fair value of warrants		(2,946)
Non-cash interest income	(134)	(112)
Other non-cash items	102	100
Unrealized foreign exchange loss on cash and cash equivalents	85
Changes in operating asset and liability accounts:
Accounts receivable	8,783	(2,874)
Inventory	1,132	108
Prepaid expenses and other assets	(496)	(1,002)
Accounts payable and accrued expenses	(7,974)	(181)
Deferred revenue	(3,894)	3,093
Net cash used in operating activities	(3,115)	(5,866)
Cash flows from investing activities:
Purchase of property, plant and equipment	(637)	(836)
Proceeds from the sale of property, plant and equipment		3,001
Change in other assets	128	94
Net cash (used in)/provided by investing activities	(509)	2,259
Cash flows from financing activities:
Repurchase of treasury stock	(376)	(283)
Net cash used in financing activities	(376)	(283)
Effect of exchange rate changes on cash	12	359
Net decrease in cash, cash equivalents and restricted cash	(3,988)	(3,531)
Cash, cash equivalents and restricted cash at beginning of period	30,864	78,198
Cash, cash equivalents and restricted cash at end of period	26,876	74,667
Supplemental schedule of cash flow information:
Cash paid for income taxes, net of refunds	225	128
Issuance of common stock to settle liabilities	88	81
Hercules [Member]
Supplemental schedule of cash flow information:
Issuance of common stock to Hercules to settle warrant liability		$ 294

Note 1 - Nature of the Business and Operations and Liquidity	3 Months Ended
	Jun. 30, 2020
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 June 30, 2020 and 2019 and the financial position at June 30, 2020 ; 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, 2020 , and notes thereto, included in the Company's Annual Report on Form 10 -K for the year ended March 31, 2020 filed with the SEC on June 2, 2020. Liquidity The Company has historically experienced recurring operating losses and as of June 30, 2020 , the Company had an accumulated deficit of $ 982.1 million. In addition, the Company has historically experienced recurring negative operating cash flows. At June 30, 2020 , the Company had cash, cash equivalents, and marketable securities of $ 56.0 million. Marketable securities include certificate of deposits with maturities between eight and twenty-one months. Cash used in operations for the three months ended June 30, 2020 was $ 3.1 million. In December 2015, the Company entered into a set of strategic agreements valued at approximately $210.0 million with Inox Wind Ltd. (“Inox” or “Inox Wind”), which includes a multi-year supply contract pursuant to which the Company will supply electrical control systems ("ECS") to Inox and a license agreement allowing Inox to manufacture a limited number of ECS. After Inox purchases the specified number of ECS required under the terms of the supply contract, Inox agreed that the Company will continue as Inox's preferred supplier and Inox will be required to purchase from the Company a majority of its ECS requirements for an additional three -year period. Pursuant to these strategic agreements, Inox must forecast future purchase orders of sets of ECS which become firm orders three months prior to shipment, and Inox must post letters of credit before the Company will ship such orders. Inox is currently delinquent on its obligation to post letters of credit for sets of ECS that Inox forecasted to purchase under the terms of the supply contract. On May 29, 2020, the Company sent written notice to Inox notifying Inox of its default under the supply contract due to Inox's failure to post letters of credit in the amount of €6.0 million for the payment of ECS that Inox is obligated to purchase under the terms of the supply contract. If Inox fails to post letters of credit in the amount of €6.0 million in accordance with the terms of the supply contract within the ninety day cure period after receipt of the default notice, then the Company may terminate the supply contract by providing written notice of such termination to Inox. We cannot predict if and when Inox will post letters of credit consistent with the forecasted ECS quantities. Inox's failure to post letters of credit and take delivery of forecasted ECS quantities would impact the Company's revenues and liquidity. In the event the Company were to terminate the supply contract, the Company's revenues and liquidity would also be impacted. In March 2020, the World Health Organization declared the disease caused by the novel coronavirus, COVID- 19, to be a pandemic. COVID- 19 has spread throughout the globe, including in the Commonwealth of Massachusetts where the Company's headquarters are located, and in other areas where the Company has business operations. In response to the outbreak, the Company has followed the guidelines of the U.S. Centers for Disease Control and Prevention and applicable state government authorities to protect the health and safety of the Company's employees, families, suppliers, customers and communities. While these existing measures and, COVID- 19 generally, have 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. While the COVID- 19 pandemic continues to rapidly evolve, the Company continues to assess the impact of the COVID- 19 pandemic to best mitigate risk and continue the operations of the Company's business. The extent to which the outbreak 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, including new information that may emerge concerning the severity of the COVID- 19 pandemic and the actions to contain it or treat its impact, among others. If the Company, its customers or suppliers experience prolonged shutdowns or other business disruptions, the Company's business, liquidity, results of operations and financial condition are likely to be materially adversely affected, and the Company's ability to access the capital markets may be limited. 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 three months ended June 30, 2020 . The Company's liquidity is highly dependent on its ability to increase revenues, including its ability to collect revenues under its agreements with Inox, its ability to control its operating costs, and its ability to raise additional capital, if necessary. The impact of the COVID- 19 pandemic 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 2 - Revenue Recognition

3 Months Ended

Jun. 30, 2020

Notes to Financial Statements

Revenue from Contract with Customer [Text Block]

Revenue Recognition

The Company's revenues in its Grid 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 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 Accounting Standards Codification ("ASC")

606,

Revenue from Contracts with Customers

. 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

months ended

June 30, 2020

and

2019

% and

% 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, 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. In each of the

three

months ended

June 30, 2020

and

2019

the Company recorded $

0.4

million in grant revenue, which is included in the Company's Grid 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 represents distinct performance obligations. The technology development transactions are primarily for activities that have

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 the profit 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 re-assessed 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

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

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

days from delivery.

The following tables disaggregate the Company's revenue by product line and by shipment destination:

	Three Months Ended June 30, 2020
Product Line:	Grid		Wind
Equipment and systems	$	16,537	$	2,618
Services and technology development		1,178		880
Total	$	17,715	$	3,498

Region:
Americas	$	10,554	$	12
Asia Pacific		6,015		3,269
EMEA		1,146		217
Total	$	17,715	$	3,498

	Three Months Ended June 30, 2019
Product Line:	Grid		Wind
Equipment and systems	$	8,354	$	3,505
Services and technology development		1,501		410
Total	$	9,855	$	3,915

Region:
Americas	$	7,801	$	46
Asia Pacific		1,827		3,856
EMEA		227		13
Total	$	9,855	$	3,915

As of

June 30, 2020

, and

June 30,

2019

, 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 “Accounts receivable (unbilled)” and “Deferred program costs” (see Note

“Accounts Receivable” and Note

“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:

	Unbilled Accounts Receivable			Deferred Program Costs			Contract Liabilities
Beginning balance as of March 31, 2020	$	5,711		$	1,631		$	26,142
Increases for costs incurred to fulfill performance obligations		—			1,978			—
Increase (decrease) due to customer billings		(3,620	)		—			12,276
Decrease due to cost recognition on completed performance obligations		—			(2,815	)		—
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations		2,033			—			(16,227	)
Other changes and FX impact		1			7			194
Ending balance as of June 30, 2020	$	4,125		$	801		$	22,385

	Unbilled Accounts Receivable			Deferred Program Costs			Contract Liabilities
Beginning balance as of March 31, 2019	$	2,213		$	318		$	15,521
Increases for costs incurred to fulfill performance obligations		—			771			—
Increase (decrease) due to customer billings		(1,584	)		—			10,857
Decrease due to cost recognition on completed performance obligations		—			(4	)		—
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations		1,467			—			(7,761	)
Other changes and FX impact		(3	)		3			73
Ending balance as of June 30, 2019	$	2,093		$	1,088		$	18,690

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

June 30, 2020

, the Company had outstanding performance obligations on existing contracts under ASC

606

to be recognized in the next

twelve

months of approximately $

53.7

million. There are also approximately $

14.5

million of outstanding performance obligations to be recognized over a period of

thirteen

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. See Note

“Nature of the Business and Operations and Liquidity,” for further information regarding the uncertainty of timing of the performance obligations as a result of the written notice that the Company sent to Inox on

May 29, 2020

notifying Inox of its default under the supply contract.

The following table sets forth customers who represented

10%

or more of the Company's total revenues for the

three

months ended

June 30, 2020

and

2019

		Three Months Ended
	Reportable	June 30,
	Segment	2020	2019
Inox Wind Limited	Wind	<10%	27%
Micron Technology	Grid	0%	25%
Siemens Gamesa Renewable Energy	Grid	25%	0%
EPC Services Company	Grid	24%	0%

- 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 http://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 http://asc.fasb.org/extlink&oid=121604090&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 http://asc.fasb.org/extlink&oid=121604090&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 http://asc.fasb.org/extlink&oid=121604090&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 http://asc.fasb.org/extlink&oid=121604090&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 http://asc.fasb.org/extlink&oid=121604090&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 http://asc.fasb.org/extlink&oid=121604090&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 http://asc.fasb.org/extlink&oid=121604090&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 http://asc.fasb.org/extlink&oid=121604090&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 http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

+ Details

Note 3 - Stock-based Compensation

3 Months Ended

Jun. 30, 2020

Notes to Financial Statements

Share-based Payment Arrangement [Text Block]

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

months ended

June 30, 2020

and

2019

(in thousands):

	Three Months Ended June 30,
	2020		2019
Cost of revenues	$	28	$	3
Research and development		130		10
Selling, general and administrative		751		236
Total	$	909	$	249

The Company issued

27,341

shares of immediately vested common stock and

658,667

shares of restricted stock awards during the

three

months ended

June 30, 2020

and issued

13,174

shares of immediately vested common stock and

160,500

shares of restricted stock awards during the

three

months ended

June 30, 2019

. These restricted stock awards generally vest over

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 outstanding stock options was less than $

0.1

million at

June 30, 2020

. This expense will be recognized over a weighted average expense period of approximately

0.9

years. The total unrecognized compensation cost for unvested outstanding restricted stock was $

6.3

million at

June 30, 2020

. This expense will be recognized over a weighted-average expense period of approximately

2.1

years.

The Company did

not

grant any stock options during the

three

months ended

June 30, 2020

. The Company granted

5,939

stock options during the

three

months ended

June 30, 2019

. The stock options granted during the

three

months ended

June 30, 2019

will vest over

ars. The weighted average assumptions used in the Black Scholes valuation model for stock options granted during the

three

months ended

June 30, 2019

are as follows:

	Three Months Ended June 30,
	2020		2019
Expected volatility		N/A		66.5	%
Risk-free interest rate		N/A		1.8	%
Expected life (years)		N/A		5.91
Dividend yield		N/A		None

Note 4 - Computation of Net Loss per Common Share

3 Months Ended

Jun. 30, 2020

Notes to Financial Statements

Earnings Per Share [Text Block]

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 the

three

months ended

June 30, 2020

0.1

million shares related to outstanding stock options were

not

included in the calculation of diluted EPS as they were considered anti-dilutive

For the

three

months ended

June 30, 2019

1.0

million shares were

not

included in the calculation of diluted EPS as they were considered anti-dilutive, of which

0.2

million relate to outstanding stock options, and

0.8

million relate to outstanding warrants.

The following table reconciles the numerators and denominators of the earnings per share calculation for the

three

months ended

June 30, 2020

and

2019

(in thousands, except per share data):

	Three Months Ended June 30,
	2020			2019
Numerator:
Net loss	$	(3,417	)	$	(3,539	)
Denominator:
Weighted-average shares of common stock outstanding		22,827			21,499
Weighted-average shares subject to repurchase		(1,138	)		(985	)
Shares used in per-share calculation ― basic		21,689			20,514
Shares used in per-share calculation ― diluted		21,689			20,514
Net loss per share ― basic	$	(0.16	)	$	(0.17	)
Net loss per share ― diluted	$	(0.16	)	$	(0.17	)

Note 5 - Goodwill	3 Months Ended
Note 5 - Goodwill	Jun. 30, 2020
Notes to Financial Statements
Goodwill Disclosure [Text Block]	5. Goodwill The Company did not identify any triggering events in the three months ended June 30, 2020 , that would require interim impairment testing of goodwill.

Note 6 - Fair Value Measurements

3 Months Ended

Jun. 30, 2020

Notes to Financial Statements

Fair Value Disclosures [Text Block]

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

measurement roll-forward and details of transfers in and out of Level

and

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

to Level

or Level

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

Level

or Level

of the fair value measurement hierarchy during the

three

months ended

June 30, 2020

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

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

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 recognized

$0.1

million in unrealized gains on marketable securities, which is recorded in other income (expense), net, for the

three

months ended

June 30, 2020

and did

not

recognize any gains or losses on marketable securities in the

three

months ended

June 30, 2019

. 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.

Warrants

The Company issued warrants in conjunction with an equity offering to Hudson Bay Capital in

November 2014

and a Loan and Security Agreement with Hercules Technology Growth Capital, Inc. (“Hercules”). The warrants issued to Hercules were exercised on

April 8, 2019.

The warrants issued to Hudson were partially exercised on

November 13, 2019

and the remaining unexercised warrants expired on

November 13, 2019.

As of

June 30, 2020

the Company has

remaining outstanding warrants.

The Company historically relied on various assumptions in a lattice model to determine the fair value of warrants. The Company had valued the warrants within Level

of the valuation hierarchy. See Note

12,

“Warrants and Derivative Liabilities,” for a discussion of the warrants and the valuation assumptions used.

The following table provides the assets and liabilities carried at fair value on a recurring basis, measured as of

June 30, 2020

and

March 31, 2020

(in thousands):

	Total Carrying Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
June 30, 2020:
Assets:
Cash equivalents	$	15,502	$	15,502	$	—	$	—
Marketable securities	$	35,330	$	35,330	$	—	$	—

	Total Carrying Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
March 31, 2020:
Assets:
Cash equivalents	$	19,394	$	19,394	$	—	$	—
Marketable securities	$	35,195	$	35,195	$	—	$	—

- 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 7 - Accounts Receivable

3 Months Ended

Jun. 30, 2020

Notes to Financial Statements

Accounts Receivable [Text Block]

Accounts Receivable

Accounts receivable at

June 30, 2020

and

March 31, 2020

consisted of the following (in thousands):

	June 30, 2020		March 31, 2020
Accounts receivable (billed)	$	4,078	$	11,276
Accounts receivable (unbilled)		4,125		5,711
Accounts receivable, net	$	8,203	$	16,987

Note 8 - Inventory

3 Months Ended

Jun. 30, 2020

Notes to Financial Statements

Inventory Disclosure [Text Block]

Inventory

Inventory, net of reserves, at

June 30, 2020

and

March 31, 2020

consisted of the following (in thousands):

	June 30, 2020		March 31, 2020
Raw materials	$	8,158	$	10,739
Work-in-process		1,677		1,345
Finished goods		6,425		5,260
Deferred program costs		801		1,631
Net inventory	$	17,061	$	18,975

The Company recorded inventory write-downs of $

0.8

million and

$0.1

million for the

three

months ended

June 30, 2020

and

2019

, 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

June 30, 2020

and

March 31, 2020

primarily represent costs incurred on programs where the Company needs to complete performance obligations before the related revenue and costs will be recognized.

Note 9 - Property, Plant and Equipment

3 Months Ended

Jun. 30, 2020

Notes to Financial Statements

Property, Plant and Equipment Disclosure [Text Block]

Property, Plant and Equipment

The cost and accumulated depreciation of property, plant and equipment at

June 30, 2020

and

March 31, 2020

are as follows (in thousands):

	June 30, 2020			March 31, 2020
Construction in progress - equipment	$	3,739		$	3,130
Equipment and software		41,798			41,737
Furniture and fixtures		1,317			1,302
Leasehold improvements		2,480			2,477
Property, plant and equipment, gross		49,334			48,646
Less accumulated depreciation		(41,003	)		(40,081	)
Property, plant and equipment, net	$	8,331		$	8,565

Depreciation expense was $

0.9

million and

$1.1

million for the

three

months ended

June 30, 2020

and

2019

, respectively. Construction in progress - equipment primarily includes capital investments in the Company's HTS equipment and leasehold improvements in the Company's leased facility in Ayer, Massachusetts.

Note 10 - Accounts Payable and Accrued Expenses

3 Months Ended

Jun. 30, 2020

Notes to Financial Statements

Accounts Payable and Accrued Liabilities Disclosure [Text Block]

10.

Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses at

June 30, 2020

and

March 31, 2020

consisted of the following (in thousands):

	June 30, 2020		March 31, 2020
Accounts payable	$	3,539	$	10,045
Accrued inventories in-transit		1,201		763
Accrued other miscellaneous expenses		2,342		1,986
Advanced deposits		665		666
Accrued compensation		3,404		5,683
Income taxes payable		946		933
Accrued product warranty		2,168		2,015
Total	$	14,265	$	22,091

The Company generally provides a

one

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 June 30,
	2020			2019
Balance at beginning of period	$	2,015		$	1,545
Change in accruals for warranties during the period		236			85
Settlements during the period		(83	)		(24	)
Balance at end of period	$	2,168		$	1,606

Note 11 - Income Taxes	3 Months Ended
Note 11 - Income Taxes	Jun. 30, 2020
Notes to Financial Statements
Income Tax Disclosure [Text Block]	11. Income Taxes The Company recorded income tax expense of $ 0.2 million in each of the three month periods ended June 30, 2020 and 2019 . 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 three months ended June 30, 2020 and did not have any gross unrecognized tax benefits as of March 31, 2020 .

- 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 + Details

Note 12 - Warrants and Derivative Liabilities	3 Months Ended
Note 12 - Warrants and Derivative Liabilities	Jun. 30, 2020
Notes to Financial Statements
Derivative Instruments and Hedging Activities Disclosure [Text Block]	12. Warrants and Derivative Liabilities The Company accounted for its warrants as liabilities due to certain adjustment provisions within the instruments, which required that they be recorded at fair value. The warrants were subject to revaluation at each balance sheet date and any change in fair value was recorded as a change in fair value of warrants until the earlier of its expiration or its exercise at which time the warrant liability was reclassified to equity. The Company calculated the fair value of the warrants utilizing an integrated lattice model. See Note 6, "Fair Value Measurements", for further discussion. Hercules Warrants On December 19, 2014, the Company entered into a second amendment to the Loan and Security Agreement with Hercules (the "Hercules Second Amendment"). In conjunction with the Hercules Second Amendment, the Company issued Hercules a warrant to purchase 58,823 shares of the Company's common stock (the "Hercules Warrant") which replaced the First Warrant and the Second Warrant. The Hercules Warrant was exercisable at any time after its issuance at an exercise price of $7.85 per share, subject to certain price-based and other anti-dilution adjustments, including the equity offering in May 2017, the acquisition of Infinia Technology Corporation ("ITC") with common stock in September 2017 and sales of common stock under the ATM entered into in January 2017. This warrant had a fair value of $0.4 million as of March 31, 2019. On April 8, 2019, Hercules notified the Company of its intent to exercise this warrant on a cashless basis. Hercules received 22,821 shares of the Company's common stock on April 17, 2019. As a result of this exercise the Company recorded a net gain of $0.1 million to change in fair value of warrants, resulting from the decrease in the fair value of the Hercules Warrant during the three months ended June 30, 2019 . November 2014 Warrant On November 13, 2014, the Company completed an offering of 909,090 units of the Company's common stock with Hudson Bay Capital. Each unit consisted of one share of the Company's common stock and 0.9 of a warrant to purchase one share of common stock, or a warrant to purchase in the aggregate 818,181 shares (the “November 2014 Warrant”). The November 2014 Warrant was exercisable at any time, at an exercise price equal to $7.81 per share, subject to certain price-based and other anti-dilution adjustments including those noted above. On November 13, 2019, Hudson partially exercised the November 2014 Warrant for 786,000 restricted shares of Company common stock at $7.81 per share . The remaining 32,181 warrants expired on November 13, 2019. The Company recorded a net gain of $2.9 million to change in fair value of warrants, resulting from the decrease in the fair value of the November 2014 Warrant during the three months ended June 30, 2019 . As of June 30, 2020 , the Company had no remaining outstanding warrants.

Note 13 - Leases

3 Months Ended

Jun. 30, 2020

Notes to Financial Statements

Lessee, Operating Leases [Text Block]

13.

Leases

April 1, 2019,

the Company adopted ASU

2016

02,

Leases (Topic

842

)

("ASC

842"

), using the modified retrospective approach. The Company elected the package of practical expedients available in the standard and as a result, did

not

reassess the lease classification of existing contracts or leases or the initial direct costs associated with existing leases. The Company did

not

elect the hindsight practical expedient and evaluated lease terms for existing leases. The Company has also elected the practical expedient to

not

separate lease components and non-lease components and will account for the leases as a single lease component for all classes of 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.

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.

The Company did

not

identify any leases that are classified as financing leases.

Supplemental balance sheet information related to leases at

June 30, 2020

and

March 31, 2020

are as follows:

	June 30, 2020			March 31, 2020
Operating Leases:
Right-of-use assets	$	3,264		$	3,359
Total right-of-use assets		3,264			3,359

Lease liabilities - ST	$	444		$	439
Lease liabilities - LT		2,891			3,000
Total operating lease liabilities		3,335			3,439

Weighted-average remaining lease term		6.7			6.9
Weighted-average discount rate		7.09	%		7.08	%

The costs related to the Company's leases for the

three

months ended

June 30, 2020

and

2019

are as follows:

	Three Months Ended		Three Months Ended
	June 30, 2020		June 30, 2019
Operating Leases:
Operating lease costs - fixed	$	178	$	178
Operating lease costs - variable		27		21
Short-term lease costs		168		233
Total lease costs		373		432

The Company's estimated minimum future lease obligations under the Company's leases are as follows:

	Operating Leases
Year ended March 31,
2020	$	501
2021		646
2022		620
2023		558
2024		501
Thereafter		1,396
Total minimum lease payments		4,222
Less: interest		(887	)
Present value of lease liabilities		3,335

Note 14 - Commitments and Contingencies	3 Months Ended
Note 14 - Commitments and Contingencies	Jun. 30, 2020
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	14. 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 June 30, 2020 and March 31, 2020 , the Company had $ 5.7 million of restricted cash included in long-term assets and $ 0.5 million of restricted cash included in current assets, respectively. 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 the Subcontract Agreement with ComEd. These deposits are held in interest bearing accounts.

Note 15 - Business Segments

3 Months Ended

Jun. 30, 2020

Notes to Financial Statements

Segment Reporting Disclosure [Text Block]

15.

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 drive trains and power ratings of

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 June 30,
	2020		2019
Revenues:
Grid	$	17,715	$	9,855
Wind		3,498		3,915
Total	$	21,213	$	13,770

	Three Months Ended June 30,
	2020			2019
Operating loss:
Grid	$	(1,188	)	$	(4,663	)
Wind		(1,120	)		(1,324	)
Unallocated corporate expenses		(909	)		(249	)
Total	$	(3,217	)	$	(6,236	)

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 primarily consist of stock-based compensation expense of $

0.9

million and

$0.2

million in the

three

months ended

June 30, 2020

and

2019

, respectively.

Total assets for the

two

business segments as of

June 30, 2020

and

March 31, 2020

are as follows (in thousands):

	June 30, 2020		March 31, 2020
Grid	$	34,651	$	44,044
Wind		11,293		14,250
Corporate assets		63,726		65,815
Total	$	109,670	$	124,109

- 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.

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+ Details

Note 16 - Recent Accounting Pronouncements	3 Months Ended
Note 16 - Recent Accounting Pronouncements	Jun. 30, 2020
Notes to Financial Statements
Accounting Standards Update and Change in Accounting Principle [Text Block]	16. 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. The ASU is effective for annual reporting periods beginning after December 15, 2019, including interim periods within that year. 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 is currently evaluating the impact, if any, that the adoption of ASU 2016 - 13 may have on its consolidated financial statements. In August 2018, the FASB issued ASU 2018 - 13, Fair Value Measurement (Topic 820 ): Changes to the Disclosure Requirements for Fair Value Measurement . The amendments in ASU 2018 - 13 provide for increased effectiveness of the disclosures made around fair value measurements while including consideration for costs and benefits. The ASU is effective for annual reporting periods beginning after December 15, 2019, including interim periods within those periods. As of April 1, 2020, the Company has adopted ASU 2018 - 13 and noted no material impact on its consolidated financial statements, primarily due to the fact that the Company does not currently report any Level 3 fair value measurements. In December 2019, the FASB issued ASU 2019 - 12, Income Taxes (Topic 740 ): Simplifying the Accounting for Income Taxes . The amendments in ASU 2019 - 12 provide for simplified accounting to several income tax situations and removal of certain accounting exceptions. The ASU is effective for annual reporting periods beginning after December 15, 2020, including interim periods within those periods. The Company does not expect the impact of the adoption of ASU 2019 - 12 to be material to 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.

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+ Details

Note 17 - Subsequent Events	3 Months Ended
Note 17 - Subsequent Events	Jun. 30, 2020
Notes to Financial Statements
Subsequent Events [Text Block]	17. 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 other than the following information, there are no such events to report. In July 2020, the Company undertook restructuring activities, approved by the Board of Directors, in order to reorganize its global manufacturing operations and reduce its workforce to better reflect the current demand for its wind products. Over the remainder of fiscal 2020 the Company intends to consolidate Wind manufacturing activities into its Massachusetts facilities and as a result reduced the headcount at its operation in Romania. The cost s associated with this restructuring event are not expected to be material to the consolidated financial statements.

Note 2 - Revenue Recognition (Tables)

3 Months Ended

Jun. 30, 2020

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended June 30, 2020
Product Line:	Grid		Wind
Equipment and systems	$	16,537	$	2,618
Services and technology development		1,178		880
Total	$	17,715	$	3,498

Region:
Americas	$	10,554	$	12
Asia Pacific		6,015		3,269
EMEA		1,146		217
Total	$	17,715	$	3,498

	Three Months Ended June 30, 2019
Product Line:	Grid		Wind
Equipment and systems	$	8,354	$	3,505
Services and technology development		1,501		410
Total	$	9,855	$	3,915

Region:
Americas	$	7,801	$	46
Asia Pacific		1,827		3,856
EMEA		227		13
Total	$	9,855	$	3,915

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, 2020	$	5,711		$	1,631		$	26,142
Increases for costs incurred to fulfill performance obligations		—			1,978			—
Increase (decrease) due to customer billings		(3,620	)		—			12,276
Decrease due to cost recognition on completed performance obligations		—			(2,815	)		—
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations		2,033			—			(16,227	)
Other changes and FX impact		1			7			194
Ending balance as of June 30, 2020	$	4,125		$	801		$	22,385

	Unbilled Accounts Receivable			Deferred Program Costs			Contract Liabilities
Beginning balance as of March 31, 2019	$	2,213		$	318		$	15,521
Increases for costs incurred to fulfill performance obligations		—			771			—
Increase (decrease) due to customer billings		(1,584	)		—			10,857
Decrease due to cost recognition on completed performance obligations		—			(4	)		—
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations		1,467			—			(7,761	)
Other changes and FX impact		(3	)		3			73
Ending balance as of June 30, 2019	$	2,093		$	1,088		$	18,690

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

		Three Months Ended
	Reportable	June 30,
	Segment	2020	2019
Inox Wind Limited	Wind	<10%	27%
Micron Technology	Grid	0%	25%
Siemens Gamesa Renewable Energy	Grid	25%	0%
EPC Services Company	Grid	24%	0%

Note 3 - Stock-based Compensation (Tables)

3 Months Ended

Jun. 30, 2020

Notes Tables

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

	Three Months Ended June 30,
	2020		2019
Cost of revenues	$	28	$	3
Research and development		130		10
Selling, general and administrative		751		236
Total	$	909	$	249

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Three Months Ended June 30,
	2020		2019
Expected volatility		N/A		66.5	%
Risk-free interest rate		N/A		1.8	%
Expected life (years)		N/A		5.91
Dividend yield		N/A		None

Note 4 - Computation of Net Loss per Common Share (Tables)

3 Months Ended

Jun. 30, 2020

Notes Tables

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

	Three Months Ended June 30,
	2020			2019
Numerator:
Net loss	$	(3,417	)	$	(3,539	)
Denominator:
Weighted-average shares of common stock outstanding		22,827			21,499
Weighted-average shares subject to repurchase		(1,138	)		(985	)
Shares used in per-share calculation ― basic		21,689			20,514
Shares used in per-share calculation ― diluted		21,689			20,514
Net loss per share ― basic	$	(0.16	)	$	(0.17	)
Net loss per share ― diluted	$	(0.16	)	$	(0.17	)

Note 6 - Fair Value Measurements (Tables)

3 Months Ended

Jun. 30, 2020

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)
June 30, 2020:
Assets:
Cash equivalents	$	15,502	$	15,502	$	—	$	—
Marketable securities	$	35,330	$	35,330	$	—	$	—

	Total Carrying Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
March 31, 2020:
Assets:
Cash equivalents	$	19,394	$	19,394	$	—	$	—
Marketable securities	$	35,195	$	35,195	$	—	$	—

Note 7 - Accounts Receivable (Tables)

3 Months Ended

Jun. 30, 2020

Notes Tables

Accounts Receivable [Table Text Block]

	June 30, 2020		March 31, 2020
Accounts receivable (billed)	$	4,078	$	11,276
Accounts receivable (unbilled)		4,125		5,711
Accounts receivable, net	$	8,203	$	16,987

Note 8 - Inventory (Tables)

3 Months Ended

Jun. 30, 2020

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	June 30, 2020		March 31, 2020
Raw materials	$	8,158	$	10,739
Work-in-process		1,677		1,345
Finished goods		6,425		5,260
Deferred program costs		801		1,631
Net inventory	$	17,061	$	18,975

Note 9 - Property, Plant and Equipment (Tables)

3 Months Ended

Jun. 30, 2020

Notes Tables

Property, Plant and Equipment [Table Text Block]

	June 30, 2020			March 31, 2020
Construction in progress - equipment	$	3,739		$	3,130
Equipment and software		41,798			41,737
Furniture and fixtures		1,317			1,302
Leasehold improvements		2,480			2,477
Property, plant and equipment, gross		49,334			48,646
Less accumulated depreciation		(41,003	)		(40,081	)
Property, plant and equipment, net	$	8,331		$	8,565

Note 10 - Accounts Payable and Accrued Expenses (Tables)

3 Months Ended

Jun. 30, 2020

Notes Tables

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

	June 30, 2020		March 31, 2020
Accounts payable	$	3,539	$	10,045
Accrued inventories in-transit		1,201		763
Accrued other miscellaneous expenses		2,342		1,986
Advanced deposits		665		666
Accrued compensation		3,404		5,683
Income taxes payable		946		933
Accrued product warranty		2,168		2,015
Total	$	14,265	$	22,091

Schedule of Product Warranty Liability [Table Text Block]

	Three Months Ended June 30,
	2020			2019
Balance at beginning of period	$	2,015		$	1,545
Change in accruals for warranties during the period		236			85
Settlements during the period		(83	)		(24	)
Balance at end of period	$	2,168		$	1,606

Note 13 - Leases (Tables)

3 Months Ended

Jun. 30, 2020

Notes Tables

Assets And Liabilities Lessee [Table Text Block]

	June 30, 2020			March 31, 2020
Operating Leases:
Right-of-use assets	$	3,264		$	3,359
Total right-of-use assets		3,264			3,359

Lease liabilities - ST	$	444		$	439
Lease liabilities - LT		2,891			3,000
Total operating lease liabilities		3,335			3,439

Weighted-average remaining lease term		6.7			6.9
Weighted-average discount rate		7.09	%		7.08	%

Lease, Cost [Table Text Block]

	Three Months Ended		Three Months Ended
	June 30, 2020		June 30, 2019
Operating Leases:
Operating lease costs - fixed	$	178	$	178
Operating lease costs - variable		27		21
Short-term lease costs		168		233
Total lease costs		373		432

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

	Operating Leases
Year ended March 31,
2020	$	501
2021		646
2022		620
2023		558
2024		501
Thereafter		1,396
Total minimum lease payments		4,222
Less: interest		(887	)
Present value of lease liabilities		3,335

Note 15 - Business Segments (Tables)

3 Months Ended

Jun. 30, 2020

Notes Tables

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

	Three Months Ended June 30,
	2020		2019
Revenues:
Grid	$	17,715	$	9,855
Wind		3,498		3,915
Total	$	21,213	$	13,770

	Three Months Ended June 30,
	2020			2019
Operating loss:
Grid	$	(1,188	)	$	(4,663	)
Wind		(1,120	)		(1,324	)
Unallocated corporate expenses		(909	)		(249	)
Total	$	(3,217	)	$	(6,236	)

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

	June 30, 2020		March 31, 2020
Grid	$	34,651	$	44,044
Wind		11,293		14,250
Corporate assets		63,726		65,815
Total	$	109,670	$	124,109

Note 1 - Nature of the Business and Operations and Liquidity (Details Textual) $ in Thousands, € in Millions	1 Months Ended	3 Months Ended
	Dec. 31, 2015 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	May 29, 2020 EUR (€)	Mar. 31, 2020 USD ($)
Retained Earnings (Accumulated Deficit), Ending Balance		$ (982,052)			$ (978,635)
Cash, Cash Equivalents, and Marketable Securities		56,000
Net Cash Provided by (Used in) Operating Activities, Total		$ (3,115)	$ (5,866)
Inox Wind Limited [Member]
Supply Agreement, Aggregate Value	$ 210,000
Supply Commitment, Extension Period (Year)	3 years
Supply Commitment, Default, Letters of Credit to be Received \| €				€ 6
Certificates of Deposit [Member] \| Minimum [Member]
Debt Securities, Available-for-sale, Term (Month)		240 days
Certificates of Deposit [Member] \| Maximum [Member]
Debt Securities, Available-for-sale, Term (Month)		1 year 270 days

Note 2 - Revenue Recognition 1 (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Revenue, Performance Obligation Satisfied, Revenue Recognized, Percentage	80.00%	78.00%
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		$ 0.4

- 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).

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+ Details

Note 2 - Revenue Recognition 2 (Details Textual) $ in Millions	Jun. 30, 2020 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	1 year
Revenue, Remaining Performance Obligation, Amount	$ 53.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Revenue, Remaining Performance Obligation, Amount	$ 14.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01 \| Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	1 year 30 days
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01 \| Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	5 years

Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Revenues	$ 21,213	$ 13,770
Grid [Member]
Revenues	17,715	9,855
Grid [Member] \| Americas [Member]
Revenues	10,554	7,801
Grid [Member] \| Asia Pacific [Member]
Revenues	6,015	1,827
Grid [Member] \| EMEA [Member]
Revenues	1,146	227
Wind [Member]
Revenues	3,498	3,915
Wind [Member] \| Americas [Member]
Revenues	12	46
Wind [Member] \| Asia Pacific [Member]
Revenues	3,269	3,856
Wind [Member] \| EMEA [Member]
Revenues	217	13
Equipment and Systems [Member] \| Grid [Member]
Revenues	16,537	8,354
Equipment and Systems [Member] \| Wind [Member]
Revenues	2,618	3,505
Services and Technology Development [Member] \| Grid [Member]
Revenues	1,178	1,501
Services and Technology Development [Member] \| Wind [Member]
Revenues	$ 880	$ 410

- 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.

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+ Details

Note 2 - Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Unbilled AR, beginning balance	$ 5,711	$ 2,213
Deferred Program Costs, beginning balance	1,631	318
Contract Liabilities, beginning balance	26,142	15,521
Deferred Program Costs, increases for costs incurred to fulfill performance obligations	1,978	771
Unbilled AR, increase (decrease) due to customer billings	(3,620)	(1,584)
Increase (decrease) due to customer billings	12,276	10,857
Unbilled AR,Decrease due to cost recognition on completed performance obligations
Deferred Program Costs, decrease due to cost recognition on completed performance obligations	(2,815)	(4)
Unbilled AR, increase (decrease) due to recognition of revenue based on transfer of control of performance obligations	2,033	1,467
Deferred Program Costs, increase (decrease) due to recognition of revenue based on transfer of control of performance obligations
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations	(16,227)	(7,761)
Unbilled AR, other changes and FX impact	1	(3)
Deferred Program Costs, other changes and FX impact	7	3
Other changes and FX impact	194	73
Unbilled AR, ending balance	4,125	2,093
Deferred Program Costs, ending balance	801	1,088
Contract Liabilities, ending balance	$ 22,385	$ 18,690

Note 2 - Revenue Recognition - Revenues By Major Customers (Details) - Customer Concentration Risk [Member] - Revenue Benchmark [Member]	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Wind [Member] \| Inox Wind Limited [Member]
Concentration risk percentage	10.00%	27.00%
Grid [Member] \| Micron Technology [Member]
Concentration risk percentage	0.00%	25.00%
Grid [Member] \| Siemens Gamesa Renewable Energy [Member]
Concentration risk percentage	25.00%	0.00%
Grid [Member] \| EPC Services Company [Member]
Concentration risk percentage	24.00%	0.00%

Note 3 - Stock-based Compensation (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)	0	5,939
Restricted Stock [Member]
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares)	658,667	160,500
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 6.3
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 36 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
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		2 years
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 0.1
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	328 days
Common Stock [Member]
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares)	27,341	13,174

Note 3 - Stock-based Compensation - Stock-based Compensation Expense By Financial Statement Line Item (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Total stock-based compensation expense	$ 909	$ 249
Cost of Sales [Member]
Total stock-based compensation expense	28	3
Research and Development Expense [Member]
Total stock-based compensation expense	130	10
Selling, General and Administrative Expenses [Member]
Total stock-based compensation expense	$ 751	$ 236

Note 3 - Stock-based Compensation - Black Scholes Valuation (Details)	3 Months Ended
	Jun. 30, 2019
Expected volatility	66.50%
Risk-free interest rate	1.80%
Expected life (years) (Year)	5 years 332 days

Note 4 - Computation of Net Loss per Common Share (Details Textual) - shares shares in Millions	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	0.1	1.0
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)		0.2
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)		0.8

Note 4 - 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
	Jun. 30, 2020	Jun. 30, 2019
Net loss	$ (3,417)	$ (3,539)
Weighted-average shares of common stock outstanding (in shares)	22,827	21,499
Weighted-average shares subject to repurchase (in shares)	(1,138)	(985)
Shares used in per-share calculation - basic (in shares)	21,689	20,514
Shares used in per-share calculation - diluted (in shares)	21,689	20,514
Net loss per share ? basic (in dollars per share)	$ (0.16)	$ (0.17)
Net loss per share ? diluted (in dollars per share)	$ (0.16)	$ (0.17)

- Definition

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

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- 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.

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+ Details

- Definition

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

+ References

+ Details

Note 6 - Fair Value Measurements (Details Textual) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Unrealized Gain (Loss) on Securities	$ 100	$ 0
Class of Warrant or Right, Outstanding (in shares)	0

Note 6 - Fair Value Measurements - Assets and Liabilities Carried at Fair Value on a Recurring Basis (Details) - Reported Value Measurement [Member] - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020
Cash equivalents	$ 15,502	$ 19,394
Marketable securities	35,330	35,195
Fair Value, Inputs, Level 1 [Member]
Cash equivalents	15,502	19,394
Marketable securities	35,330	35,195
Fair Value, Inputs, Level 2 [Member]
Cash equivalents
Marketable securities
Fair Value, Inputs, Level 3 [Member]
Cash equivalents
Marketable securities

Note 7 - Accounts Receivable - Summary of Accounts Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020
Accounts receivable (billed)	$ 4,078	$ 11,276
Accounts receivable (unbilled)	4,125	5,711
Accounts receivable, net	$ 8,203	$ 16,987

Note 8 - Inventory (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Inventory Write-down	$ 789	$ 89

Note 8 - Inventory - Summary of Net Inventory (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020
Raw materials	$ 8,158	$ 10,739
Work-in-process	1,677	1,345
Finished goods	6,425	5,260
Deferred program costs	801	1,631
Net inventory	$ 17,061	$ 18,975

Note 9 - Property, Plant and Equipment (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Depreciation, Depletion and Amortization, Total	$ 0.9	$ 1.1

Note 9 - Property, Plant and Equipment - Cost and Accumulated Depreciation of Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020
Property, plant and equipment, gross	$ 49,334	$ 48,646
Less accumulated depreciation	(41,003)	(40,081)
Property, plant and equipment, net	8,331	8,565
Construction in Progress [Member]
Property, plant and equipment, gross	3,739	3,130
Equipment and Software [Member]
Property, plant and equipment, gross	41,798	41,737
Furniture and Fixtures [Member]
Property, plant and equipment, gross	1,317	1,302
Leasehold Improvements [Member]
Property, plant and equipment, gross	$ 2,480	$ 2,477

Note 10 - Accounts Payable and Accrued Expenses (Details Textual)	3 Months Ended
	Jun. 30, 2020
Minimum [Member]
Extended Warranty Trigger Period (Year)	1 year
Maximum [Member]
Extended Warranty Trigger Period (Year)	3 years

Note 10 - Accounts Payable and Accrued Expenses - Summary of Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020
Accounts payable	$ 3,539	$ 10,045
Accrued inventories in-transit	1,201	763
Accrued other miscellaneous expenses	2,342	1,986
Advanced deposits	665	666
Accrued compensation	3,404	5,683
Income taxes payable	946	933
Accrued product warranty	2,168	2,015
Total	$ 14,265	$ 22,091

Note 10 - Accounts Payable and Accrued Expenses - Product Warranty Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Balance at beginning of period	$ 2,015	$ 1,545
Change in accruals for warranties during the period	236	85
Settlements during the period	(83)	(24)
Balance at end of period	$ 2,168	$ 1,606

Note 11 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020
Income Tax Expense (Benefit), Total	$ 188	$ 211
Liability for Uncertainty in Income Taxes, Current	$ 0
Unrecognized Tax Benefits, Ending Balance			$ 0

- Definition

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

+ References + Details

Note 12 - Warrants and Derivative Liabilities (Details Textual) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended		12 Months Ended
	Nov. 13, 2019	Apr. 17, 2019	Dec. 19, 2014	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Mar. 31, 2019	Nov. 13, 2014
Gain (Loss) in Change of Fair Value of Derivative Instruments and Warrants, Net of Tax					$ 2,946
Class of Warrant or Right, Outstanding (in shares)				0
Hercules Warrants [Member]
Gain (Loss) on Decrease Fair Value Upon Exercise of Warrant						$ 100
November 2014 Warrant [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 7.81							$ 7.81
Common Unit, Issued (in shares)								909,090
Common Shares Per Unit (in shares)								1
Class of Warrant or Right, Number of Warrants to Purchase One Share of Stock (in shares)								0.9
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)								818,181
Class of Warrant or Right, Warrants Exercised (in shares)	786,000
Class of Warrant or Right, Warrants Expired (in shares)	32,181
Gain (Loss) in Change of Fair Value of Derivative Instruments and Warrants, Net of Tax					$ 2,900
Hercules Technology Growth Capital [Member]
Stock Issued During Period, Shares, Warrant Exercised (in shares)		22,821
Secured Debt [Member] \| Hercules Technology Growth Capital [Member] \| Hercules Warrants [Member]
Purchase Commitment, Issuance of Warrants, Shares of Common Stock (in shares)			58,823
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)						$ 7.85
Derivative, Fair Value, Net, Total							$ 400

Note 13 - Leases (Details Textual)	Jun. 30, 2020
Maximum [Member]
Lessee, Operating Lease, Renewal Term (Year)	5 years

Note 13 - Leases - Operating Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020
Right-of-use assets	$ 3,264	$ 3,359
Lease liability, current portion	444	439
Lease liability, long term portion	2,891	3,000
Total operating lease liabilities	$ 3,335	$ 3,439
Weighted-average remaining lease term (Year)	6 years 255 days	6 years 328 days
Weighted-average discount rate	7.09%	7.08%

Note 13 - Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating lease costs - fixed	$ 178	$ 178
Operating lease costs - variable	27	21
Short-term lease costs	168	233
Total lease costs	$ 373	$ 432

Note 13 - Leases - Minimum Future Lease Obligation (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020
2020	$ 501
2021	646
2022	620
2023	558
2024	501
Thereafter	1,396
Total minimum lease payments	4,222
Less: interest	(887)
Total operating lease liabilities	$ 3,335	$ 3,439

Note 14 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020
Restricted Cash and Cash Equivalents, Noncurrent, Total	$ 5,659	$ 5,657
Preconfirmation, Restricted Cash and Cash Equivalents, Current	$ 500

Note 15 - Business Segments (Details Textual) $ in Thousands	3 Months Ended
	Jun. 30, 2020 USD ($) Boe	Jun. 30, 2019 USD ($)
Number of Reportable Segments	2
Share-based Payment Arrangement, Expense	$ 909	$ 249
Corporate, Non-Segment [Member]
Share-based Payment Arrangement, Expense	$ 900	$ 200
Minimum [Member]
Number of Reportable Segments (Barrel of Oil Equivalent) \| Boe	2

Note 15 - Business Segments - Operating Results for Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Revenues	$ 21,213	$ 13,770
Operating profit (loss)	(3,217)	(6,236)
Corporate, Non-Segment [Member]
Operating profit (loss)	(909)	(249)
Grid [Member]
Revenues	17,715	9,855
Grid [Member] \| Operating Segments [Member]
Operating profit (loss)	(1,188)	(4,663)
Wind [Member]
Revenues	3,498	3,915
Wind [Member] \| Operating Segments [Member]
Operating profit (loss)	$ (1,120)	$ (1,324)

- Definition

+ References

+ Details

Note 15 - Business Segments - Total Business Segments Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020
Total assets	$ 109,670	$ 124,109
Operating Segments [Member] \| Grid [Member]
Total assets	34,651	44,044
Operating Segments [Member] \| Wind [Member]
Total assets	11,293	14,250
Corporate, Non-Segment [Member]
Total assets	$ 63,726	$ 65,815

- 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

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