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Note 14 - Debt (Details Textual) $ in Thousands | Sep. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | May 06, 2021
--- | --- | --- | ---
Debt, Current | $ 57 | $ 75 |
Equipment Financing Agreements Assumed In Business Acquisition [Member] |  |  |
Debt, Current | $ 100 | $ 100 |
Neeltran Inc. [Member] |  |  |
Business Combination, Number of Equipment Financing Agreement Assumed |  |  | 4

X
- Definition Represents number of equipment financing agreement assumed for business combination. + References No definition available. + Details
Name: | amsc_BusinessCombinationNumberOfEquipmentFinancingAgreementAssumed
Namespace Prefix: | amsc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of debt and lease obligation, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(21)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_DebtCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentAxis=amsc_EquipmentFinancingAgreementsAssumedInBusinessAcquisitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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