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Other Accrued Liabilities (Tables)
 3 Months Ended
Oct. 31, 2012
Other Accrued Liabilities [Abstract]  
Other Accrued Liabilities
   
October 31,
 2012
   
July 31,
2012
 
           
Allowance for contract adjustments
 
$
2,723,974
   
$
2,724,474
 
Other
   
1,105,699
     
1,208,114
 
                 
  
 
$
3,829,673
   
$
3,932,588