Note J - Commitments and Contingencies (Details Textual) - USD ($)	9 Months Ended
	Jan. 31, 2023	Jan. 31, 2022
Operating Lease, Percent of Facilities Leased	79.00%
Operating Lease, Expense	$ 6,500,000	$ 5,900,000
Operating Lease, Weighted Average Discount Rate, Percent	4.40%
Letters of Credit Outstanding, Amount	$ 2,850,000
Minimum [Member] | Dealership Leases [Member]
Lessee, Operating Lease, Term of Contract (Year)	3 years
Maximum [Member] | Dealership Leases [Member]
Lessee, Operating Lease, Term of Contract (Year)	5 years