Accounts Receivable

12 Months Ended

Jul. 31, 2016

Accounts Receivable Additional Disclosures [Abstract]

Accounts Receivable

Accounts Receivable

Accounts receivable consist of the following at July 31, 2016 and 2015:

	2016		2015
Billed receivables from commercial and international customers	$	90,185,000	39,062,000
Billed receivables from the U.S. government and its agencies	21,465,000		8,375,000
Unbilled receivables from commercial and international customers	19,333,000		21,898,000
Unbilled receivables on U.S government and its agencies contracts-in-progress	21,013,000		1,126,000
Total accounts receivable	151,996,000		70,461,000
Less allowance for doubtful accounts	1,029,000		1,206,000
Accounts receivable, net	$	150,967,000	69,255,000

Unbilled receivables relate to contracts-in-progress for which revenue has been recognized but we have not yet billed the customer for work performed. We had $118,000 of retainage included in unbilled receivables at July 31, 2016 and virtually no retainage at July 31, 2015 and management estimates that approximately 92.6% of the total unbilled receivables at July 31, 2016 will be billed and collected within one year. Of the unbilled receivables from commercial and international customers at July 31, 2016 and July 31, 2015, approximately $6,070,000 and $20,256,000, respectively, relates to our two large over-the-horizon microwave system contracts with our large U.S. prime contractor customer (all of which related to our North African country end-customer).

As of July 31, 2016, the U.S. government (and its agencies) represented 27.9% of total accounts receivable and 10.5% of total accounts receivable were from customers located in a North African country. As of July 31, 2015, the U.S. government (and its agencies) and one large U.S. prime contractor customer (the majority of which related to our North African country end-customer) represented 13.5% and 36.3%, respectively, of total accounts receivable.