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Note B - Summary of Significant Accounting Policies (Details Textual)
 3 Months Ended 6 Months Ended 12 Months Ended 18 Months Ended
Oct. 31, 2020
USD ($)
Oct. 31, 2019
USD ($)
Oct. 31, 2020
USD ($)
shares
Oct. 31, 2019
USD ($)
Apr. 30, 2020
USD ($)
Oct. 31, 2020
USD ($)
Jul. 31, 2019
Apr. 30, 2019
USD ($)
Number of Reportable Segments     1          
Average Finance Receivable Interest Rate     16.50%          
Interest Receivable $ 2,643,000   $ 2,643,000   $ 3,098,000 $ 2,643,000    
Finance Receivables, Customer Payments Due Either Weekly or Bi-Weekly, Percentage     77.00%          
Financing Receivable, Greater Than or Equal to 30 Days Past Due, Percent of Portfolio 2.50% 3.50% 2.50% 3.50%   2.50%    
Financing Receivable, Weighted Average Total Contract Term (Month)     34 months 21 days          
Financing Receivable, Remaining Contract Term (Month)     26 months          
Financing Receivable, Allowance for Credit Loss, Ending Balance $ 172,965,000 $ 135,481,000 $ 172,965,000 $ 135,481,000 155,041,000 $ 172,965,000   $ 127,842,000
Finance Receivables, Allowance, Percent of Principle Balance 26.50%   26.50%     26.50% 24.50% 25.00%
Finance Receivable Principal Balance $ 692,775,000 587,087,000 $ 692,775,000 $ 587,087,000 621,182,000 $ 692,775,000    
Percent of Chargeoffs in the First 10 to 11 Months of a Contract 50.00%   50.00%     50.00%    
Average Age of Account at Charge-Off Date (Month)           13 months    
Goodwill, Impairment Loss     $ 0   0      
Effective Income Tax Rate Reconciliation, Percent, Total     23.50% 22.20%        
Tax Adjustments, Settlements, and Unusual Provisions     $ (331,000) $ (415,000)        
Open Tax Year     2017 2018 2019 2020          
Income Tax Examination, Penalties and Interest Accrued, Total $ 0   $ 0   0 $ 0    
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due 1,576,000 2,226,000 1,576,000 2,226,000 3,082,000 1,576,000    
Late Fee Income Generated by Servicing Financial Assets, Amount     1,100,000 980,000        
Contract with Customer, Liability, Revenue Recognized     9,300,000          
Income Tax Expense (Benefit), Total 6,554,000 $ 4,070,000 $ 12,529,000 8,398,000        
Treasury Stock Shares to Establish Reserve Account to Secure Service Contracts (in shares) | shares     10,000          
ACM Insurance Company [Member]                
Treasury Stock, Shares to Establish Reserve Account to Meet Regulatory Requirements for Insurance Company (in shares) | shares     14,000          
Accounting Standards Update 2016-09 [Member]                
Income Tax Expense (Benefit), Total     $ (331,000) $ (415,000)        
Minimum [Member]                
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period (Year)     1 year          
Maximum [Member]                
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period (Year)     5 years          
Payment Protection Plan [Member]                
Contract with Customer, Liability, Total 26,840,000   $ 26,840,000   24,480,000 26,840,000    
Service Contract [Member]                
Contract with Customer, Liability, Total $ 13,236,000   13,236,000   $ 11,641,000 $ 13,236,000    
Revolving Credit Facility [Member]                
Line of Credit Facility, Distribution Limitations, Maximum Aggregate Amount of Stock Repurchases     $ 50,000,000          
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases     20.00%          
Line of Credit Facility, Distribution Limitations Percentage of Consolidated Net Income     75.00%          
Line of Credit Facility Distribution Limitations Minimum Percentage of Aggregate Funds Available     12.50%          
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Arkansas, USA [Member]                
Concentration Risk, Percentage     28.00%