XML 14 R1.htm IDEA: XBRL DOCUMENT v3.22.1
Document And Entity Information - USD ($)
 12 Months Ended
Mar. 31, 2022
May 27, 2022
Sep. 30, 2021
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 FY    
Document Fiscal Year Focus 2022    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Mar. 31, 2022    
Document Transition Report false    
Entity File Number 000-19672    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 04-2959321    
Entity Address, Address Line One 114 East Main Street    
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    
Title of 12(b) Security $0.01 par value per share    
Trading Symbol AMSC    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 397,800,000
Entity Common Stock, Shares Outstanding   28,520,644  
Auditor Name RSM US LLP    
Auditor Location Boston, MA    
Auditor Firm ID 49