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Other intangible assets (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2015
Mar. 31, 2014
Other Intangible Assets Details 1    
Land use right of factory land in Shenzhen, Guangdong, PRC $ 1,880 $ 2,062
Land use right of factory land in Xinxing, Guangdong, PRC 2,239 2,325
Total $ 4,119 $ 4,387