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Intangible assets (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Other Intangible Assets Details 1    
Land use right of factory land in Shenzhen, Guangdong, PRC $ 1,014 $ 1,274
Land use right of factory land in Xinxing, Guangdong, PRC 1,324 1,513
Total $ 2,338 $ 2,787