Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Cash Flows from Operating Activities
Net Income	$ 6,098	$ 9,051	$ 9,458
Adjustments to reconcile net income to net cash provided by operating activites:
Depreciation and amortization	9,272	8,473	7,371
Amortization of investment discounts	15	30	(9)
Non-cash stock compensation expense	727	641	340
Excess tax benefits for share-based payments	(92)	(342)	(383)
Deferred income taxes	(2,568)	3,515	(1,763)
Provision for bad debts	32	36	(62)
Loss on the sale of property, plant and equipment	445	168	45
Capacity rationalization charges	1,623	0	0
(Increase) decrease in:
Accounts receivable	(1,026)	(2,075)	1,884
Inventories	(456)	(3,207)	1,772
Prepaid expenses	1,878	(2,954)	505
Other assets	(510)	(110)	466
Increase (decrease) in:
Accounts payable	456	275	1,702
Accrued expenses	1,622	(1,384)	2,496
Deferred compensation	921	378	926
Pension and postretirement benefits	4,730	672	1,341
Other liabilities	172	(59)	127
Total Adjustments	17,241	4,057	16,758
Net Cash Provided by Operating Activities	23,339	13,108	26,216
Cash Flows from Investing Activities
Capital expenditures	(6,960)	(13,806)	(10,413)
Proceeds from sale of property, plant and equipment	31	149	375
Purchases of investment in short-term securities	(17,601)	(60,083)	(21,852)
Dispositions of investment in short-term securities	24,260	50,075	24,000
Net Cash Used in Investing Activities	(270)	(23,665)	(7,890)
Cash Flows from Financing Activities
Proceeds from issuance of notes payable	0	18,500	0
Principal payments on notes payable	(3,600)	(3,500)	(3,200)
Dividends paid	(4,486)	(4,218)	(3,992)
Purchase of treasury stock	(6,247)	(2,474)	(5,988)
Proceeds from issuance of treasury stock	31	221	103
Proceeds from issuance of common stock	321	914	1,258
Excess tax benefits for share-based payments	92	342	383
Net Cash (Used in) Provided by Financing Activities	(13,889)	9,785	(11,436)
Effect of exchange rate changes on cash and cash equivalents	28	(105)	33
Net Increase (Decrease) in Cash and Cash Equivalents	9,208	(877)	6,923
Cash and Cash Equivalents, Beginning of Year	17,885	18,762	11,839
Cash and Cash Equivalents, End of Year	$ 27,093	$ 17,885	$ 18,762