Condensed Consolidated Balance Sheet Parentheticals (Parentheticals) - USD ($) $ in Thousands	Jul. 31, 2019	Jul. 31, 2018
Current Assets
Allowance for doubtful accounts	$ 644	$ 817
Other Assets
Trademarks and patents accumulated amortization	299	267
Customer list accumulated amortization	6,297	5,540
Noncurrent Liabilities
Debt Issuance Costs, Noncurrent, Net	$ 31	$ 60
Common Stock
Stockholders’ Equity
Common Stock, par value per share	$ 0.10	$ 0.10
Common Stock, shares issued	8,284,199	8,086,849
Treasury Stock, shares	2,926,547	2,914,092
Common Class B
Stockholders’ Equity
Common Stock, par value per share	$ 0.10	$ 0.10
Common Stock, shares issued	2,576,479	2,468,979
Treasury Stock, shares	324,741	324,741