Condensed Consolidated Balance Sheet Parentheticals (Parentheticals) - USD ($) $ in Thousands	Jul. 31, 2018	Jul. 31, 2017
Current Assets
Allowance for doubtful accounts	$ 817	$ 748
Other Assets
Trademarks and patents accumulated amortization	267	238
Customer list accumulated amortization	5,540	4,601
Noncurrent Liabilities
Debt Issuance Costs, Noncurrent, Net	$ 60	$ 89
Stockholders’ Equity
Common Stock, par value per share	$ 0.10	$ 0.10
Common Stock
Stockholders’ Equity
Common Stock, par value per share	$ 0.10	$ 0.10
Common Stock, shares issued	8,086,849	8,015,166
Treasury Stock, shares	2,914,092	2,907,370
Common Class B
Stockholders’ Equity
Common Stock, par value per share	$ 0.10	$ 0.10
Common Stock, shares issued	2,468,979	2,513,512
Treasury Stock, shares	324,741	324,741