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Note 9 - Prepaid and Other Current Assets (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Employee Retention Credits Receivable |  |  |  |  |  | $ 3.3
Proceeds From Employee Retention Credit |  |  |  | $ 3.0 |  |
Cost of Sales [Member] |  |  |  |  |  |
Employee Retention Credits Benefit |  |  |  |  | $ 1.8 |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |
Employee Retention Credits Benefit |  |  |  |  | 0.8 |
Research and Development Expense [Member] |  |  |  |  |  |
Employee Retention Credits Benefit |  |  |  |  | 0.7 |
Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |  |
Employee Retention Credits Receivable |  |  |  |  | $ 3.3 |
Maximum [Member] |  |  |  |  |  |
Percentage of Qualified Wages Paid | 70.00% | 70.00% | 50.00% |  |  |

X
- Definition Represents employee retention credits benefit. + References No definition available. + Details
Name: | amsc_EmployeeRetentionCreditsBenefit
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents employee retention credits receivable. + References No definition available. + Details
Name: | amsc_EmployeeRetentionCreditsReceivable
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents percentage of qualified wages paid. + References No definition available. + Details
Name: | amsc_PercentageOfQualifiedWagesPaid
Namespace Prefix: | amsc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents proceeds received for initial claims that were processed. + References No definition available. + Details
Name: | amsc_ProceedsFromEmployeeRetentionCredit
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_ResearchAndDevelopmentExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
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: |