Condensed Consolidated Statements of Income and Retained Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Oct. 31, 2011	Oct. 31, 2010
Net Sales	$ 59,582	$ 56,285
Cost of Sales	(45,379)	(43,077)
Gross Profit	14,203	13,208
Selling, General and Administrative Expenses	(12,407)	(9,386)
Income from Operations	1,796	3,822
Other Income (Expense)
Interest expense	(524)	(411)
Interest income	8	19
Other, net	193	50
Total Other Income (Expense), Net	(323)	(342)
Income Before Income Taxes	1,473	3,480
Income taxes	(398)	(961)
Net Income	1,075	2,519
Retained Earnings
Retained Earnings at Beginning of Year	121,388	116,917
Cash dividends declared and treasury stock issuances	(1,207)	(1,238)
Retained Earnings at Period End	$ 121,256	$ 118,198
Net Income Per Share
Diluted (in dollars per share)	$ 0.15	$ 0.35
Average Shares Outstanding
Diluted (in shares)	7,100	7,123
Common Stock
Net Income Per Share
Basic Common (in dollars per share)	$ 0.16	$ 0.38
Average Shares Outstanding
Basic Common (in shares)	5,114	5,086
Common Class B
Net Income Per Share
Basic Common (in dollars per share)	$ 0.12	$ 0.30
Average Shares Outstanding
Basic Common (in shares)	1,920	1,897