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Note 18 - Employee Benefit Plans (Details Textual) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
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 | $ 0.5 | $ 0.4

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 https://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