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Other intangible assets (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Other Intangible Assets Details 1    
Land use right of factory land in Shenzhen, Guangdong, PRC $ 2,062 $ 2,215
Land use right of factory land in Xinxing, Guangdong, PRC 2,325 2,375
Total $ 4,387 $ 4,590