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Sales and marketing
 12 Months Ended
Mar. 31, 2014
Other Income And Expenses [Abstract]  
Other Income And Other Expense Disclosure [Text Block]
13.
Sales and marketing
 
Sales and marketing expense includes advertising cost of US$1,650,747, US$92,135 and US$313,336 for the fiscal years ended March 31, 2012, 2013 and 2014 respectively.