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Note 12 - Equity Method Investments (Details Textual)	Sep. 30, 2024
NWL Pacific Inc. Co., LTD [Member]
Equity Method Investment, Ownership Percentage	50.00%

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=amsc_NwlPacificIncCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: