Note 14 - Debt (Details Textual) $ in Thousands	Dec. 31, 2021 USD ($)	May 06, 2021	Mar. 31, 2021 USD ($)
Debt, Current, Total	$ 72		$ 0
Long-term Debt, Excluding Current Maturities, Total	113		$ 0
Equipment Financing Agreements Assumed In Business Acquisition [Member]
Debt, Current, Total	100
Long-term Debt, Excluding Current Maturities, Total	$ 100
Neeltran Inc. [Member]
Business Combination, Number of Equipment Financing Agreement Assumed		4

Represents number of equipment financing agreement assumed for business combination.

No definition available.

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Namespace Prefix:	amsc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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

- Details

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