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Note 17 - Employee Benefit Plans (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Defined Contribution Plan, Company Contribution, Percentage Match Common Stock	50.00%
Defined Contribution Plan, Percentage of First Eligible Employee Contribution Matched by Employer	6.00%
Defined Contribution Plan, Cost	$ 0.4	$ 0.3

X

- Definition

Defined Contribution Plan Company Contribution Percentage Match Common Stock

+ References

No definition available.

+ Details

Name:	amsc_DefinedContributionPlanCompanyContributionPercentageMatchCommonStock
Namespace Prefix:	amsc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Defined Contribution Plan Percentage Of First Eligible Employee Contribution Matched By Employer

+ References

No definition available.

+ Details

Name:	amsc_DefinedContributionPlanPercentageOfFirstEligibleEmployeeContributionMatchedByEmployer
Namespace Prefix:	amsc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration