Note E - Accrued Liabilities - Accrued Liabilities (Details) - USD ($) $ in Thousands	Apr. 30, 2023	Apr. 30, 2022
Statement [Line Items]
Employee compensation and benefits	$ 11,197	$ 12,865
Deferred sales tax (see Note B)	8,543	7,388
Reserve for accident protection plan claims	5,694	4,761
Fair value of contingent consideration	1,943	3,544
Other	6,229	4,072
Accrued liabilities	$ 33,606	$ 32,630