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Income Taxes (Details 4) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Movement of Valuation Allowances [Roll Forward] |  |  |
At the beginning of the year | $ 548 | $ 567 | $ 612
Current year (reduction) addition | 120 | (19) | (45)
At the end of the year | $ 668 | $ 548 | $ 567

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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