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Accounts Receivable (Tables)
3 Months Ended
Jul. 31, 2012
Receivables [Abstract]  
Accounts receivable
   July 31,
2012
   April 30,
2012
 
Trade receivables  $3,133,755   $2,620,461 
VAT receivable   81,341    184,314 
Allowance for doubtful accounts and sales returns   (200,000)   (200,000)
   $3,015,096   $2,604,775