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Note J - Commitments and Contingencies (Details Textual) - USD ($)
9 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Apr. 30, 2019
Operating Lease, Percent of Facilities Leased 81.00%    
Operating Leases, Rent Expense, Total $ 5,100,000 $ 5,000,000  
Operating Lease, Weighted Average Discount Rate, Percent     4.73%
Letters of Credit Outstanding, Amount $ 250,000    
Minimum [Member]      
Lessee, Operating Lease, Term of Contract 3 years    
Maximum [Member]      
Lessee, Operating Lease, Term of Contract 5 years