v2.4.0.6
Document and Entity Information
9 Months Ended
Dec. 31, 2010
Jan. 31, 2011
Document and Entity Information    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Dec. 31, 2010  
Document Fiscal Year Focus 2011  
Document Fiscal Period Focus Q3  
Entity Registrant Name AMERICAN SUPERCONDUCTOR CORP /DE/  
Entity Central Index Key 0000880807  
Current Fiscal Year End Date --03-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   50,701,749