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Note L - Commitments and Contingencies (Details Textual) - USD ($)
 12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Statement [Line Items]      
Letters of Credit Outstanding, Amount $ 2,850,000    
Lessee, Operating Lease, Liability, to be Paid 82,187,000    
Operating Lease, Expense 9,000,000.0 $ 8,000,000.0 $ 8,000,000.0
Non-cancelable [Member]      
Statement [Line Items]      
Lessee, Operating Lease, Liability, to be Paid 13,300,000    
Reasonably Assured [Member]      
Statement [Line Items]      
Lessee, Operating Lease, Liability, to be Paid $ 68,900,000    
Minimum [Member]      
Statement [Line Items]      
Lessee, Operating Lease, Term of Contract (Year) 3 years    
Minimum [Member] | Dealership Leases [Member]      
Statement [Line Items]      
Lessee, Operating Lease, Term of Contract (Year) 3 years    
Maximum [Member]      
Statement [Line Items]      
Lessee, Operating Lease, Term of Contract (Year) 10 years    
Maximum [Member] | Dealership Leases [Member]      
Statement [Line Items]      
Lessee, Operating Lease, Term of Contract (Year) 5 years