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Intangible assets (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2021
Mar. 31, 2020
Other Intangible Assets Details 1    
Land use right of factory land in Shenzhen, Guangdong, PRC $ 663 $ 780
Land use right of factory land in Xinxing, Guangdong, PRC 1,150 1,150
Total $ 1,813 $ 1,930