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Income Taxes (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Deferred tax: |  |  |
Current tax | $ 209 |  |
Total | 209 | (26) | 512
Hong Kong [Member] |  |  |
Current tax | 11 | 4 | 156
Overprovision in prior year |  | (30) |
China [Member] |  |  |
Current tax |  |  | $ 356

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