Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ 3,050	$ 2,009
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,192	3,159
Amortization of investment net discount	(25)	(2)
Stock-based compensation	359	431
Excess tax benefits for share-based payments	0	(128)
Deferred income taxes	111	165
Provision for bad debts and cash discounts	(22)	48
Loss on the sale of fixed assets	7	161
(Increase) Decrease in assets:
Accounts receivable	718	(688)
Inventories	(154)	(367)
Prepaid expenses	(1,361)	(1,057)
Other assets	75	(114)
Increase (Decrease) in liabilities:
Accounts payable	(825)	476
Accrued expenses	(3,275)	(3,592)
Deferred compensation	330	274
Pension and postretirement benefits	334	464
Other liabilities	54	86
Total Adjustments	(482)	(684)
Net Cash Provided by Operating Activities	2,568	1,325
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(4,045)	(4,295)
Proceeds from sale of property, plant and equipment	8	1
Purchases of short-term investments	(13,012)	(5,119)
Dispositions of short-term investments	18,480	9,946
Net Cash Provided by Investing Activities	1,431	533
CASH FLOWS FROM FINANCING ACTIVITIES
Principal payments on notes payable	(3,083)	(3,083)
Dividends paid	(1,553)	(1,477)
Purchase of treasury stock	(27)	(122)
Excess tax benefits for share-based payments	0	128
Net Cash Used in Financing Activities	(4,663)	(4,554)
Effect of exchange rate changes on cash and cash equivalents	(30)	58
Net Decrease in Cash and Cash Equivalents	(694)	(2,638)
Cash and Cash Equivalents, Beginning of Period	9,095	18,629
Cash and Cash Equivalents, End of Period	8,401	15,991
Supplemental disclosure of non-cash investing and financing activities:
Capital expenditures accrued, but not paid	711	821
Cash dividends declared and accrued, but not paid	$ 1,559	$ 1,479