Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Cash Flows from Operating Activities
Net Income	$ 12,615	$ 8,222
Adjustments to reconcile net income to net cash provided by operating activites:
Depreciation and amortization	13,330	12,756
Amortization of investment discounts	(10)	(129)
Non-cash stock compensation expense	2,407	1,600
Deferred income taxes	(406)	7,270
Provision for bad debts and cash discounts	(179)	252
Loss on the sale of property, plant and equipment	6	84
Life insurance benefits	0	(340)
(Increase) decrease in:
Accounts receivable	(1,729)	(522)
Inventories	(1,693)	225
Prepaid expenses	(786)	(807)
Other assets	(617)	134
Increase (decrease) in:
Accounts payable	590	(2,436)
Accrued expenses	(589)	771
Deferred compensation	(86)	(5,437)
Pension and postretirement benefits	3,307	(11,048)
Other liabilities	583	17
Total Adjustments	14,128	2,390
Net Cash Provided by Operating Activities	26,743	10,612
Cash Flows from Investing Activities
Capital expenditures	(15,029)	(15,074)
Proceeds from sale of property, plant and equipment	7	48
Acquisition of business	0	(730)
Purchases of short-term investments	(4,678)	(35,911)
Dispositions of short-term investments	11,812	52,492
Proceeds from life insurance	0	1,747
Net Cash (Used in) Provided by Investing Activities	(7,888)	2,572
Cash Flows from Financing Activities
Principal payments on notes payable	(3,083)	(3,083)
Dividends paid	(6,656)	(6,230)
Purchase of treasury stock	(147)	(26)
Net Cash Used in Financing Activities	(9,886)	(9,339)
Effect of exchange rate changes on cash and cash equivalents	136	(183)
Net Increase in Cash and Cash Equivalents	9,105	3,662
Cash and Cash Equivalents, Beginning of Year	12,757	9,095
Cash and Cash Equivalents, End of Year	21,862	12,757
Other cash flows:
Interest payments, net of amounts capitalized	305	282
Income Taxes Paid, Net [Abstract]
Proceeds from Income Tax Refunds	(713)
Income taxes		1,994
Noncash investing and financing activities:
Capital expenditures accrued, but not paid	2,263	997
Cash dividends declared and accrued, but not paid	$ 1,761	$ 1,627