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Note 9 - Note Receivable (Details Textual) - 64 Jackson, LLC [Member] $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 01, 2018 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Mar. 28, 2018
Purchase and Sale Agreement, Total Consideration | $ 23.0 |  |  |
Security Deposit | 1.0 |  |  |
Financing Receivable, after Allowance for Credit Loss, Noncurrent, Total | $ 6.0 |  |  |
Notes and Loans Receivable, Number of Installments |  |  | 2 |
Notes and Loans Receivable, Installment Amount |  |  | $ 3.0 |
Notes Receivable, Stated Interest Rate |  |  | 1.96% | 1.96%
Notes Receivable, Fair Value Disclosure |  | $ 5.7 |  |
Note Receivable Discount Rate |  | 6.00% |  |
Notes and Loans Receivable, Noncurrent Portion of Unamortized Debt Discount |  | $ 0.3 |  |
Deferred Gain on Sale of Property |  | $ 0.1 |  |

X
- Definition Represents the discount rate on a note receivable. + References No definition available. + Details
Name: | amsc_NoteReceivableDiscountRate
Namespace Prefix: | amsc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of each installment for notes and loans receivable. + References No definition available. + Details
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Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the noncurrent portion of an unamortized debt discount on notes and loans receivable. + References No definition available. + Details
Name: | amsc_NotesAndLoansReceivableNoncurrentPortionOfUnamortizedDebtDiscount
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the number of installments for notes and loans receivable. + References No definition available. + Details
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Namespace Prefix: | amsc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the stated interest rate on notes receivable. + References No definition available. + Details
Name: | amsc_NotesReceivableStatedInterestRate
Namespace Prefix: | amsc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the amount of consideration received under a purchase and sale agreement. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | instant

X
- Definition Amount, after allowance for credit loss, of financing receivable, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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X
- Definition Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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X
- Definition The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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X
- Details
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