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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
Components of income before income taxes |  |  |
Income before income taxes, total | $ 15,577 | $ 16,677 | $ 8,760
United States [Member] |  |  |
Components of income before income taxes |  |  |
Income before income taxes, total | 14,597 | 16,708 | 8,954
China [Member] |  |  |
Components of income before income taxes |  |  |
Income before income taxes, total | $ 980 | $ (31) | $ (194)

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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1(i) -Article 4 + Details
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