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Note 12 - Lease Commitments (Details Textual) - USD ($)
6 Months Ended
Oct. 31, 2023
Oct. 31, 2022
Apr. 30, 2023
May 01, 2019
Operating Lease, Liability, Total $ 5,472,000     $ 10,340,000
Lease Incentive Receivable       765,000
Operating Lease, Expense 750,000 $ 750,000    
Operating Lease, Payments 810,000      
Property and Equipment [Member]        
Operating Lease, Right-of-Use Asset $ 4,704,000   $ 5,300,000 $ 9,575,000