Accounts Receivable

9 Months Ended

Apr. 30, 2017

Accounts Receivable Additional Disclosures [Abstract]

Accounts Receivable

Accounts Receivable

Accounts receivable consist of the following at:

	April 30, 2017		July 31, 2016
Billed receivables from commercial and international customers	$	69,149,000	90,185,000
Unbilled receivables from commercial and international customers	24,929,000		19,333,000
Billed receivables from the U.S. government and its agencies	16,918,000		21,465,000
Unbilled receivables from the U.S. government and its agencies	10,927,000		21,013,000
Total accounts receivable	121,923,000		151,996,000
Less allowance for doubtful accounts	1,475,000		1,029,000
Accounts receivable, net	$	120,448,000	150,967,000

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 both April 30, 2017 and July 31, 2016 and management estimates that substantially all of the total unbilled receivables at April 30, 2017 will be billed and collected within one year. Of the unbilled receivables from commercial and international customers at April 30, 2017 and July 31, 2016, approximately $3,593,000 and $6,070,000, respectively, relates to a large over-the-horizon microwave system contract with our large U.S. prime contractor customer (all of which related to our North African country end-customer).

As of April 30, 2017, the U.S. government (and its agencies) and Verizon Communications Inc. (through various divisions) represented 22.8% and 11.3%, respectively, of total accounts receivable. As of July 31, 2016, except for the U.S. government (and its agencies), which represented 27.9% of total accounts receivable, there were no other customers which accounted for greater than 10.0% of total accounts receivable.

As of July 31, 2016, 10.5% of our total accounts receivable related to our North African country end customers.