Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jul. 31, 2025	Jul. 31, 2024
Allowance for doubtful accounts	$ 1,493	$ 934
Trademarks and patents accumulated amortization	693	625
Customer list accumulated amortization	9,278	8,149
Unamortized debt issuance costs	$ 183	$ 226
Common Stock
Common Stock, shares issued	15,276,261	15,172,186
Common Stock, par value per share	$ 0.10	$ 0.10
Treasury Stock, shares	4,902,881	4,867,880
Class B
Common Stock, shares issued	4,650,484	4,652,984
Common Stock, par value per share	$ 0.10	$ 0.10
Treasury Stock, shares	380,628	362,649