Condensed Consolidated Statements of Income and Retained Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012
Net Sales	$ 64,152	$ 59,780	$ 186,691	$ 179,565
Cost of Sales	(47,261)	(45,075)	(136,300)	(136,103)
Gross Profit	16,891	14,705	50,391	43,462
Selling, General and Administrative Expenses	(12,209)	(11,743)	(35,863)	(33,875)
Capacity Rationalization Charges	(8)	0	(70)	0
Income from Operations	4,674	2,962	14,458	9,587
Other Income (Expense)
Interest expense	(447)	(529)	(1,374)	(1,557)
Interest income	7	8	24	22
Other, net	207	193	421	334
Total Other Income (Expense), Net	(233)	(328)	(929)	(1,201)
Income Before Income Taxes	4,441	2,634	13,529	8,386
Income taxes	(1,190)	(742)	(3,680)	(2,180)
Net Income	3,251	1,892	9,849	6,206
Retained Earnings
Balance at beginning of period			122,901	121,388
Cash dividends declared and treasury stock issuances			3,502	3,475
Balance at end of period	$ 129,248	$ 124,119	$ 129,248	$ 124,119
Net Income Per Share
Diluted (in dollars per share)	$ 0.46	$ 0.26	$ 1.40	$ 0.86
Average Shares Outstanding
Diluted (in shares)	6,938	7,117	6,916	7,116
Common Stock
Net Income Per Share
Basic Common (in dollars per share)	$ 0.50	$ 0.28	$ 1.52	$ 0.93
Average Shares Outstanding
Basic Common (in shares)	4,923	5,115	4,899	5,118
Common Class B
Net Income Per Share
Basic Common (in dollars per share)	$ 0.37	$ 0.21	$ 1.14	$ 0.70
Average Shares Outstanding
Basic Common (in shares)	1,980	1,938	1,966	1,932