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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Mar. 31, 2014
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Note Payable Current |  |
Note payable, Unamortized Discount | $ 306 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_BalanceSheetLocationAxis = amsc_NotesPayableCurrentMember | $ 555 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_BalanceSheetLocationAxis = amsc_NotesPayableCurrentMember
Note Payable Noncurrent |  |
Note payable, Unamortized Discount | $ 298 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_BalanceSheetLocationAxis = amsc_NotesPayableNoncurrentMember | $ 287 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_BalanceSheetLocationAxis = amsc_NotesPayableNoncurrentMember

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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |