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Intangible assets, net (Details Textual) - USD ($)
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Finite-Lived Intangible Assets [Line Items]      
Amortization expense of intangible assets   $ 371,280 $ 414,959
Customer Contracts [Member]      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets, amortization period 3 years    
Intellectual Property [Member]      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets, amortization period 7 years