Accounts Receivable (Tables)

12 Months Ended

Jul. 31, 2019

Accounts receivable consist of the following at July 31, 2019 and 2018:



	2019		2018
Receivables from commercial and international customers	$	85,556,000	83,411,000
Unbilled receivables from commercial and international customers	20,469,000		19,731,000
Receivables from the U.S. government and its agencies	38,856,000		26,251,000
Unbilled receivables from the U.S government and its agencies	2,018,000		19,807,000
Total accounts receivable	146,899,000		149,200,000
Less allowance for doubtful accounts	1,867,000		1,761,000
Accounts receivable, net	$	145,032,000	147,439,000