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Note C - Finance Receivables, Net (Details Textual)
 3 Months Ended
Jul. 31, 2022
USD ($)
Jul. 31, 2021
USD ($)
Finance Receivables, Number of Loan Classes 1  
Finance Receivables, Number of Risk Pools 1  
Financing Receivable, Allowance for Credit Loss, Recovery $ 587,000 $ 582,000
Net Charge Offs as Percentage of Average Finance Receivables 5.60% 4.30%
Collections as Percentage of Average Financing Receivables 9.10% 11.50%
Delinquencies Greater Than 30 Days as Percentage of Average Financing Receivables 3.60% 3.30%
Increase (Decrease) in Average Selling Price $ 3,050  
Increase (Decrease) in Average Selling Price, Percentage 19.80%  
Maximum [Member]    
Financing Receivable Interest Rate 16.50%  
Financing Receivable Payment Period (Month) 54 months  
Maximum [Member] | ILLINOIS    
Financing Receivable Interest Rate 21.50%  
Minimum [Member]    
Financing Receivable Payment Period (Month) 18 months  
Minimum [Member] | ILLINOIS    
Financing Receivable Interest Rate 19.50%