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Accounts Receivable
 9 Months Ended
Apr. 30, 2012
Accounts Receivable [Abstract]  
Accounts Receivable

(7)                 Accounts Receivable

 

                Accounts receivable consist of the following:

 
April 30, 2012

 
July 31, 2011

Billed receivables from commercial customers

$    34,429,000

 

     38,245,000

Billed receivables from the U.S. government and its agencies

      33,533,000

 

     22,075,000

Unbilled receivables on contracts-in-progress

        6,187,000

 

     11,701,000

Total accounts receivable

      74,149,000

 

     72,021,000

Less allowance for doubtful accounts

        1,140,000

 

       1,220,000

                Accounts receivable, net

$    73,009,000

 

     70,801,000

 

 

Unbilled receivables on contracts-in-progress include $2,942,000 and $4,487,000 at April 30, 2012 and July 31, 2011, respectively, due from the U.S. government and its agencies. There was $13,000 and $28,000 of retainage included in unbilled receivables at April 30, 2012 and July 31, 2011, respectively. In the opinion of management, substantially all of the unbilled balances will be billed and collected within one year.