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Allowance for doubtful trade accounts receivables (Tables)
 12 Months Ended
Mar. 31, 2013
Receivables [Abstract]  
Allowance for Doubtful Trade Accounts Receivables

Allowance for doubtful trade accounts receivables

 

Description

    Balance at
Beginning  of
Period		      Expense /
Reversal		     Bad debts
written off		     Effect of
exchange rate
changes		     Balance at
end
of period		  
     US$      US$     US$     US$     US$  

Fiscal 2013

      3,200,434         (48,580 )      (2,106,011 )      (169,543 )      876,300   

Fiscal 2012

      4,022,664         37,700        (423,245 )      (436,685 )      3,200,434   

Fiscal 2011

      4,128,829         (144,263 )      —          38,098        4,022,664