Condensed Consolidated Balance Sheet Parenthetical (USD $) In Thousands, except Share data, unless otherwise specified	Oct. 31, 2013	Jul. 31, 2013
Current Assets
Allowance for doubtful accounts	$ 656	$ 641
Other Assets
Accumulated amortization Trademarks and patents	433	427
Accumulated amortization Debt issuance costs	472	455
Accumulated amortization Licensing and non-compete agreements	$ 1,924	$ 1,861
Common Stock
Stockholder's Equity
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares issued	7,894,460	7,866,560
Treasury stock, common shares	2,915,567	2,914,567
Common Class B
Stockholder's Equity
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares issued	2,399,668	2,394,487
Treasury stock, common shares	324,741	324,741