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Accounts Receivable
12 Months Ended
Jul. 31, 2012
Accounts Receivable Additional Disclosures [Abstract]  
Accounts Receivable
(3) Accounts Receivable

Accounts receivable consist of the following at July 31, 2012 and 2011:
 
 
2012
 
2011
Billed receivables from commercial customers
 
$
41,139,000

 
38,245,000

Billed receivables from the U.S. government and its agencies
 
11,927,000

 
22,075,000

Unbilled receivables on contracts-in-progress
 
4,764,000

 
11,701,000

Total accounts receivable
 
57,830,000

 
72,021,000

Less allowance for doubtful accounts
 
1,588,000

 
1,220,000

Accounts receivable, net
 
$
56,242,000

 
70,801,000



Unbilled receivables on contracts-in-progress include $3,320,000 and $4,487,000 at July 31, 2012 and 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 July 31, 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.