Accounts Receivable

3 Months Ended

Oct. 31, 2017

Accounts Receivable Additional Disclosures [Abstract]

Accounts Receivable

Accounts Receivable

Accounts receivable consist of the following at:

	October 31, 2017		July 31, 2017
Billed receivables from commercial and international customers	$	66,349,000	71,404,000
Unbilled receivables from commercial and international customers	17,215,000		24,668,000
Billed receivables from the U.S. government and its agencies	14,709,000		18,497,000
Unbilled receivables from the U.S. government and its agencies	17,172,000		11,693,000
Total accounts receivable	115,445,000		126,262,000
Less allowance for doubtful accounts	1,502,000		1,300,000
Accounts receivable, net	$	113,943,000	124,962,000

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 $108,000 and $118,000 of retainage included in unbilled receivables at October 31, 2017 and July 31, 2017, respectively, and management estimates that substantially all of the unbilled receivables at October 31, 2017 will be billed and collected within one year. Of the unbilled receivables from commercial and international customers at October 31, 2017 and July 31, 2017, approximately $2,839,000 and $2,995,000, 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 October 31, 2017 and July 31, 2017, the U.S. government (and its agencies) represented 27.6% and 23.9%, respectively, of total accounts receivable. There were no other customers which accounted for greater than 10.0% of total accounts receivable at both October 31, 2017 and July 31, 2017.