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Note C - Finance Receivables, Net (Details Textual)
 12 Months Ended
Apr. 30, 2021
USD ($)
Apr. 30, 2020
USD ($)
Apr. 30, 2019
USD ($)
Jan. 31, 2020
Jul. 31, 2019
May 01, 2019
Finance Receivables, Number of Loan Classes 1          
Finance Receivables, Number of Risk Pools 1          
Net Charge Offs as Percentage of Average Finance Receivables 19.30% 23.10%        
Collections as Percentage of Average Financing Receivables 53.20% 55.10%        
Delinquencies Greater Than 30 Days as Percentage of Average Financing Receivables 2.60% 6.20%        
Finance Receivables, Allowance, Percent of Principle Balance       24.50% 24.50% 25.00%
Financing Receivable, Credit Loss, Expense (Reversal) $ 163,662,000 $ 162,246,000 $ 146,363,000      
Average Selling Price of Entity's Products $ 13,621 $ 11,793        
COVID-19 Pandemic [Member]            
Finance Receivables, Allowance, Percent of Principle Balance 24.50% 26.50%        
Financing Receivable, Credit Loss, Expense (Reversal) $ (15,100,000)          
Minimum [Member]            
Financing Receivable Interest Rate 15.00%          
Financing Receivable Payment Period (Month) 18 months          
Minimum [Member] | ILLINOIS            
Financing Receivable Interest Rate 19.50%          
Maximum [Member]            
Financing Receivable Interest Rate 16.50%          
Financing Receivable Payment Period (Month) 54 years          
Maximum [Member] | ILLINOIS            
Financing Receivable Interest Rate 21.50%