Consolidated Balance Sheets Parenthetical (USD $) In Thousands, except Share data, unless otherwise specified	Jul. 31, 2012	Jul. 31, 2011
Current Assets
Allowance for doubtful accounts	$ 626	$ 607
Other Assets
Accumulated amortization trademarks and patents	409	381
Accumulated amortization debt issuance	380	333
Accumulated amortization licensing and non-compete agreements	$ 1,611	$ 1,361
Common stock, par value	$ 0.10
Common Stock
Other Assets
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares issued	7,786,241	7,750,324
Treasury stock, common shares	2,911,564	2,642,387
Common Class B
Other Assets
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares issued	2,374,859	2,372,859
Treasury stock, common shares	324,741	324,741