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Income Taxes (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Total | $ (26) | $ 512 | $ 236
Hong Kong [Member] |  |  |
Current tax | 4 | 156 | 103
Overprovision in prior year | (30) |  |
China [Member] |  |  |
Current tax |  | $ 356 | $ 133

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