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Note 6 - Fair Value Measurements (Details Textual) - shares | Sep. 30, 2023 | Oct. 01, 2020
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Northeast Power Systems, Inc (NEPSI) [Member] |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High, Number of Shares (in shares) | 1,000,000 | 1,000,000

X
- Definition 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. + References No definition available. + Details
Name: | amsc_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHighNumberOfShares
Namespace Prefix: | amsc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=amsc_NortheastPowerSystemsIncNEPSIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |