Note N - Correction of An Immaterial Error In Previously Issued Financial Statements - Correction of An Immaterial Error In Previously Issued Financial Statements (Details) - USD ($) $ in Thousands	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Statement [Line Items]
Finance receivables, net	$ 1,073,764	$ 863,674	$ 632,270	$ 472,401
Deferred income tax liabilities, net	39,315	30,449
Retained earnings	$ 685,802	665,410
Previously Reported [Member]
Statement [Line Items]
Finance receivables, net		854,290
Deferred income tax liabilities, net		28,233
Retained earnings		658,242
Revision of Prior Period, Adjustment [Member]
Statement [Line Items]
Finance receivables, net		9,384
Deferred income tax liabilities, net		2,216
Retained earnings		$ 7,168