Accounts Receivable (Tables)

12 Months Ended

Jul. 31, 2015

Accounts Receivable Additional Disclosures [Abstract]

Accounts Receivable

Accounts receivable consist of the following at July 31, 2015 and 2014:

	2015		2014
Billed receivables from commercial customers	$	39,062,000	31,681,000
Billed receivables from the U.S. government and its agencies	8,375,000		10,316,000
Unbilled receivables on contracts-in-progress	23,024,000		13,517,000
Total accounts receivable	70,461,000		55,514,000
Less allowance for doubtful accounts	1,206,000		627,000
Accounts receivable, net	$	69,255,000	54,887,000