Condensed Consolidated Statements of Income and Retained Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Net Sales	$ 61,122	$ 60,203	$ 122,539	$ 119,785
Cost of Sales	(44,853)	(45,649)	(89,039)	(91,028)
Gross Profit	16,269	14,554	33,500	28,757
Selling, General and Administrative Expenses	(12,834)	(9,725)	(23,654)	(22,132)
Capacity Rationalization Charges	(50)	0	(62)	0
Income from Operations	3,385	4,829	9,784	6,625
Other Income (Expense)
Interest expense	(446)	(504)	(927)	(1,028)
Interest income	8	6	17	14
Other, net	84	(52)	214	141
Total Other Income (Expense), Net	(354)	(550)	(696)	(873)
Income Before Income Taxes	3,031	4,279	9,088	5,752
Income taxes	(885)	(1,040)	(2,490)	(1,438)
Net Income	2,146	3,239	6,598	4,314
Retained Earnings
Balance at beginning of period			122,901	121,388
Cash dividends declared and treasury stock issuances			3,502	2,339
Balance at end of period	$ 125,997	$ 123,363	$ 125,997	$ 123,363
Net Income Per Share
Diluted (in dollars per share)	$ 0.31	$ 0.45	$ 0.94	$ 0.60
Average Shares Outstanding
Diluted (in shares)	6,922	7,128	6,904	7,114
Common Stock
Net Income Per Share
Basic Common (in dollars per share)	$ 0.33	$ 0.49	$ 1.02	$ 0.65
Average Shares Outstanding
Basic Common (in shares)	4,896	5,124	4,887	5,119
Common Class B
Net Income Per Share
Basic Common (in dollars per share)	$ 0.25	$ 0.36	$ 0.77	$ 0.49
Average Shares Outstanding
Basic Common (in shares)	1,976	1,938	1,960	1,929