Accounts Receivable (Tables)

12 Months Ended

Jul. 31, 2014

Accounts Receivable Additional Disclosures [Abstract]

Accounts Receivable

Accounts receivable consist of the following at July 31, 2014 and 2013:

	2014		2013
Billed receivables from commercial customers	$	31,681,000	40,005,000
Billed receivables from the U.S. government and its agencies	10,316,000		8,114,000
Unbilled receivables on contracts-in-progress	13,517,000		2,399,000
Total accounts receivable	55,514,000		50,518,000
Less allowance for doubtful accounts	627,000		603,000
Accounts receivable, net	$	54,887,000	49,915,000