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Note 15 - Debt (Details Textual) $ in Thousands	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Mar. 31, 2024 USD ($)	May 06, 2021
Debt, Current	$ 0		$ 25
Equipment Financing Agreements Assumed In Business Acquisition [Member]
Debt, Current		$ 0
Long-Term Debt, Excluding Current Maturities	$ 0		0
Equipment Financing Agreements Assumed In Business Acquisition [Member] | Maximum [Member]
Debt, Current			$ 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.

+ 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(22))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
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: