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Note C - Finance Receivables, Net (Details Textual) - USD ($)
 3 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Apr. 30, 2020
Apr. 30, 2019
Finance Receivables, Weighted Average Interest Rate 16.40%      
Finance Receivables, Number of Loan Classes 1      
Finance Receivables, Number of Risk Pools 1      
Net Charge Offs as Percentage of Average Finance Receivables 4.80% 5.40%    
Collections as Percentage of Average Financing Receivables 13.00% 13.50%    
Delinquencies Greater Than 30 Days as Percentage of Average Financing Receivables 2.60% 3.80%    
Finance Receivables, Allowance, Percent of Principle Balance 26.50% 24.50%   25.00%
Increase (Decrease) in Average Selling Price $ 1,390      
Increase (Decrease) in Average Selling Price, Percentage 12.20%      
COVID-19 Pandemic [Member]        
Finance Receivables, Allowance, Percent of Principle Balance     26.50%  
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) 48 months      
Maximum [Member] | ILLINOIS        
Financing Receivable Interest Rate 21.50%