Condensed Consolidated Balance Sheet Parenthetical - USD ($) $ in Thousands	Apr. 30, 2020	Jul. 31, 2019
Current Assets
Allowance for doubtful accounts	$ 1,324	$ 644
Other Assets
Accumulated amortization of other intangibles	415	299
Accumulated amortization of customer lists	6,739	6,297
Current Liabilities
Net unamortized debt issuance costs	$ 10
Noncurrent Liabilities
Net unamortized debt issuance costs		$ 31
Common Stock
Stockholder's Equity
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares issued	8,371,197	8,284,199
Treasury stock, common shares	3,063,813	2,926,547
Common Class B
Stockholder's Equity
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares issued	2,511,958	2,576,479
Treasury stock, common shares	335,816	324,741