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Valuation And Qualifying Accounts | 12 Months Ended
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Mar. 31, 2013
Valuation and Qualifying Accounts [Abstract] |
Valuation And Qualifying Accounts | American Superconductor Corporation Schedule II—Valuation and Qualifying Accounts (In thousands)
|  | Balance, |  |  | Recoveries |  | Balance,
|  | Beginning of |  |  | and Other |  | End of
|  | Year | Additions | Write-offs | Adjustments |  | Year
Allowance for doubtful accounts receivable: |  |  |  |  |  |  |
Fiscal year ended March 31, 2013 | $ | 52 | - | (52) | - | $ | -
Fiscal year ended March 31, 2012 |  | 683 | 6 | (631) | (6) |  | 52
Fiscal year ended March 31, 2011 |  | 766 | 28 | (118) | 7 |  | 683
|  | Balance, |  |  | Recoveries |  | Balance,
|  | Beginning of |  |  | and Other |  | End of
|  | Year | Additions | Write-offs | Adjustments |  | Year
Deferred tax asset valuation allowance: |  |  |  |  |  |  |
Fiscal year ended March 31, 2013 | $ | 252,302 | 21,333 | (11,674) | - | $ | 261,961
Fiscal year ended March 31, 2012 |  | 220,596 | 41,709 | (10,003) | - |  | 252,302
Fiscal year ended March 31, 2011 |  | 187,358 | 43,308 | (10,063) | (7) |  | 220,596

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- Definition The entire disclosure for 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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