Accounts Receivable

12 Months Ended

Jul. 31, 2013

Accounts Receivable Additional Disclosures [Abstract]

Accounts Receivable

(3) Accounts Receivable

Accounts receivable consist of the following at July 31, 2013 and 2012:

	2013		2012
Billed receivables from commercial customers	$	40,005,000	41,139,000
Billed receivables from the U.S. government and its agencies	8,114,000		11,927,000
Unbilled receivables on contracts-in-progress	2,399,000		4,764,000
Total accounts receivable	50,518,000		57,830,000
Less allowance for doubtful accounts	603,000		1,588,000
Accounts receivable, net	$	49,915,000	56,242,000

Unbilled receivables on contracts-in-progress include $699,000 and $3,320,000 at July 31, 2013 and 2012, respectively, due from the U.S. government and its agencies. We had virtually no retainage included in unbilled receivables at both July 31, 2013 and 2012, respectively. In the opinion of management, a substantial portion of the unbilled balances will be billed and collected within one year.