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Summary of Significant Accounting Policies (Details Textuals 1)
 12 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Revenues
      
Revenue, Major Customer [Line Items]      
Concentration risk, benchmark description more than 10 more than 10 more than 10
Concentration risk, customer no single customer accounted for more than 10 no single customer accounted for more than 10 no single customer accounted for more than 10
Accounts receivables
      
Revenue, Major Customer [Line Items]      
Concentration risk, benchmark description more than 10 more than 10  
Concentration risk, customer one customer accounted for more than 10% no single customer accounted for more than 10%