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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Common stock, par value	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized	75,000,000us-gaap_CommonStockSharesAuthorized	150,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	9,624,275us-gaap_CommonStockSharesIssued	7,892,990us-gaap_CommonStockSharesIssued
Treasury Stock, shares	34,067us-gaap_TreasuryStockShares	5,705us-gaap_TreasuryStockShares
Note Payable Current
Note payable, Unamortized Discount	$ 244us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_BalanceSheetLocationAxis = amsc_NotesPayableCurrentMember	$ 555us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_BalanceSheetLocationAxis = amsc_NotesPayableCurrentMember
Note Payable Noncurrent
Note payable, Unamortized Discount	$ 290us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_BalanceSheetLocationAxis = amsc_NotesPayableNoncurrentMember	$ 287us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_BalanceSheetLocationAxis = amsc_NotesPayableNoncurrentMember

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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