Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Apr. 30, 2026	Apr. 30, 2025
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ 42,551	$ 40,941
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17,186	16,391
Non-cash stock-based compensation	4,077	3,880
Provision for bad debts and cash discounts	(169)	436
Loss on impairment of patent applications	0	48
Accretion of Asset Retirement Obligation	190	143
Loss on the disposals of property, plant and equipment	413	29
(Increase) Decrease in assets:
Accounts receivable	(6,203)	(3,816)
Inventories	(766)	(2,547)
Prepaid expenses	463	1,234
Deferred income taxes	73	(116)
Other assets	4,091	3,012
Increase (Decrease) in liabilities:
Accounts payable	(641)	495
Accrued expenses	(5,529)	(2,268)
Deferred compensation	642	548
Other liabilities	(3,170)	(3,422)
Total Adjustments	10,657	14,047
Net Cash Provided by Operating Activities	53,208	54,988
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(20,918)	(24,483)
Proceeds from sale of property, plant, and equipment	0	89
Acquisition of a business	0	(115)
Dispositions of short-term investments	312	0
Net Cash Used in Investing Activities	(20,606)	(24,509)
CASH FLOWS FROM FINANCING ACTIVITIES
Payments on revolving credit facility	0	(10,000)
Dividends paid	(7,626)	(6,290)
Purchase of treasury stock	(12,537)	(2,233)
Net Cash Used in Financing Activities	(20,163)	(18,523)
Effect of exchange rate changes on Cash and Cash Equivalents	44	38
Net Increase in Cash and Cash Equivalents	12,483	11,994
Cash, Cash Equivalents and Restricted Cash, Beginning of Period	50,458	24,481
Cash, Cash Equivalents and Restricted Cash, End of Period	62,941	36,475
Supplemental disclosure of non-cash investing and financing activities:
Restricted Cash	0	0
Converted to unrestricted cash	0	(885)
Interest payments, net of amounts capitalized	1,152	1,172
Income tax payments, net of refunds	7,635	9,588
Change in capital expenditures in accounts payable	(2,323)	(2,253)
Change in capital expenditures in accrued expenses	(1,014)	(4,620)
Cash dividends declared and accrued	$ 2,750	$ 2,105