Condensed Consolidated Balance Sheet Parentheticals (Parentheticals) - USD ($) $ in Thousands	Jul. 31, 2020	Jul. 31, 2019
Current Assets
Allowance for doubtful accounts	$ 1,078	$ 644
Other Assets
Trademarks and patents accumulated amortization	457	299
Customer list accumulated amortization	6,887	6,297
Noncurrent Liabilities
Debt Issuance Costs, Noncurrent, Net	$ 150	$ 31
Common Stock
Stockholders’ Equity
Common Stock, par value per share	$ 0.10	$ 0.10
Common Stock, shares issued	8,449,003	8,284,199
Treasury Stock, shares	3,090,230	2,926,547
Common Class B
Stockholders’ Equity
Common Stock, par value per share	$ 0.10	$ 0.10
Common Stock, shares issued	2,437,402	2,576,479
Treasury Stock, shares	335,816	324,741