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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Mar. 31, 2011
Schedule II - Valuation and Qualifying Accounts |
Schedule II - Valuation and Qualifying Accounts | American Superconductor Corporation Schedule II—Valuation and Qualifying Accounts (In thousands)
| Balance, Beginning of Year | Additions | Write-offs | Recoveries and Other Adjustments | Balance, End of Year
Allowance for doubtful accounts receivable: |  |  |  |  |
Fiscal year ended March 31, 2011 | $ 766 | 28 | (118) | 7 | $ 683
Fiscal year ended March 31, 2010 | 1,343 | 286 | (54) | (809) | 766
Fiscal year ended March 31, 2009 | 5 | 1,652 | (203) | (111) | 1,343
| Balance, Beginning of Year | Additions | Expirations | Adjustments | Balance, End of Year
Deferred tax asset valuation allowance: |  |  |  |  |
Fiscal year ended March 31, 2011 | $ 187,358 | 43,308 | (10,063) | (7) | 220,596
Fiscal year ended March 31, 2010 | 174,695 | 16,189 | (4,148) | 622 | 187,358
Fiscal year ended March 31, 2009 | 171,664 | 7,055 | — | (4,024 ) | 174,695

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- Definition Valuation and Qualifying Accounts [Abstract] + Details
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- Definition An element designated to encapsulate the entire schedule of any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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