Consolidated Statements of Stockholders Equity Statement - USD ($) $ in Thousands	Total	Common & Class B Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income
Total, Beginning of Period at Jul. 31, 2024	$ 210,588	$ 1,982	$ 60,031	$ 232,247	$ (84,441)	$ 769
Common & Class B Stock, Beginning of Period (in shares) at Jul. 31, 2024		19,825,170
Treasury Stock, Beginning of Period (in shares) at Jul. 31, 2024					(5,230,529)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	29,297	$ 0	0	29,297	$ 0	0
Other Comprehensive Income (Loss)	(208)	0	0	0	0	(208)
Dividends Declared	(4,195)	0	0	(4,195)	0	0
Purchases of Treasury Stock	(2,164)	0	0	0	$ (2,164)	0
Purchases of Treasury Stock (in shares)					(33,421)
Net issuance of stock under long-term incentive plans	0	$ 5	622	0	$ 627	0
Net issuance of stock under long-term incentive plans (in shares)		(41,275)			(12,022)
Amortization of Restricted Stock	2,542	$ 0	2,542	0	$ 0	0
Total, End of Period at Jan. 31, 2025	235,860	$ 1,987	63,195	257,349	$ (87,232)	561
Common Stock & Class B Stock, End of Period (in shares) at Jan. 31, 2025		19,866,445
Treasury Stock, End of Period (in shares) at Jan. 31, 2025					(5,275,972)
Total, Beginning of Period at Oct. 31, 2024	223,992	$ 1,986	61,755	246,525	$ (87,001)	727
Common & Class B Stock, Beginning of Period (in shares) at Oct. 31, 2024		19,865,970
Treasury Stock, Beginning of Period (in shares) at Oct. 31, 2024					(5,270,270)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	12,921	$ 0	0	12,921	$ 0	0
Other Comprehensive Income (Loss)	(166)	0	0	0	0	(166)
Dividends Declared	(2,097)	0	0	(2,097)	0	0
Purchases of Treasury Stock	(180)	0	0	0	$ (180)	0
Purchases of Treasury Stock (in shares)					(4,419)
Net issuance of stock under long-term incentive plans	0	$ 1	50	0	$ 51	0
Net issuance of stock under long-term incentive plans (in shares)		(475)			(1,283)
Amortization of Restricted Stock	1,390	$ 0	1,390	0	$ 0	0
Total, End of Period at Jan. 31, 2025	235,860	$ 1,987	63,195	257,349	$ (87,232)	561
Common Stock & Class B Stock, End of Period (in shares) at Jan. 31, 2025		19,866,445
Treasury Stock, End of Period (in shares) at Jan. 31, 2025					(5,275,972)
Total, Beginning of Period at Jul. 31, 2025	259,060	$ 1,993	66,138	277,500	$ (87,540)	969
Common & Class B Stock, Beginning of Period (in shares) at Jul. 31, 2025		19,926,745
Treasury Stock, Beginning of Period (in shares) at Jul. 31, 2025					(5,283,509)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	28,025	$ 0	0	28,025	$ 0	0
Other Comprehensive Income (Loss)	106	0	0	0	0	106
Dividends Declared	(5,182)	0	0	(5,182)	0	0
Purchases of Treasury Stock	(12,364)	0	0	0	$ (12,364)	0
Purchases of Treasury Stock (in shares)					(222,120)
Net issuance of stock under long-term incentive plans	0	$ 6	37	0	$ 43	0
Net issuance of stock under long-term incentive plans (in shares)		(62,500)			(1,200)
Amortization of Restricted Stock	2,805	$ 0	2,805	0	$ 0	0
Total, End of Period at Jan. 31, 2026	272,450	$ 1,999	68,980	300,343	$ (99,947)	1,075
Common Stock & Class B Stock, End of Period (in shares) at Jan. 31, 2026		19,989,245
Treasury Stock, End of Period (in shares) at Jan. 31, 2026					(5,506,829)
Total, Beginning of Period at Oct. 31, 2025	266,527	$ 1,998	67,597	290,523	$ (94,516)	925
Common & Class B Stock, Beginning of Period (in shares) at Oct. 31, 2025		19,978,445
Treasury Stock, Beginning of Period (in shares) at Oct. 31, 2025					(5,401,248)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	12,569	$ 0	0	12,569	$ 0	0
Other Comprehensive Income (Loss)	150	0	0	0	0	150
Dividends Declared	(2,749)	0	0	(2,749)	0	0
Purchases of Treasury Stock	(5,404)	0	0	0	$ (5,404)	0
Purchases of Treasury Stock (in shares)					(104,881)
Net issuance of stock under long-term incentive plans	0	$ 1	26	0	$ 27	0
Net issuance of stock under long-term incentive plans (in shares)		(10,800)			(700)
Amortization of Restricted Stock	1,357	$ 0	1,357	0	$ 0	0
Total, End of Period at Jan. 31, 2026	$ 272,450	$ 1,999	$ 68,980	$ 300,343	$ (99,947)	$ 1,075
Common Stock & Class B Stock, End of Period (in shares) at Jan. 31, 2026		19,989,245
Treasury Stock, End of Period (in shares) at Jan. 31, 2026					(5,506,829)