Note 6 - Fair Value Measurements (Details Textual) - shares	Dec. 31, 2023	Oct. 01, 2020
Northeast Power Systems, Inc (NEPSI) [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High, Number of Shares (in shares)	300,000	1,000,000

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid in shares.

No definition available.

Name:	amsc_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHighNumberOfShares
Namespace Prefix:	amsc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant