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Note B - Summary of Significant Accounting Policies (Details Textual)
 3 Months Ended 9 Months Ended 18 Months Ended
Jan. 31, 2021
USD ($)
Jan. 31, 2020
USD ($)
Jan. 31, 2021
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shares
Jan. 31, 2020
USD ($)
Jan. 31, 2021
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Apr. 30, 2020
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Jul. 31, 2019
Apr. 30, 2019
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Jan. 31, 2019
Number of Reportable Segments     1            
Average Finance Receivable Interest Rate     16.50%            
Interest Receivable $ 3,008,000   $ 3,008,000   $ 3,008,000 $ 3,098,000      
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 2.80%   2.80%   2.80%       3.60%
Financing Receivable, Weighted Average Total Contract Term (Month)     35 months 21 days            
Financing Receivable, Remaining Contract Term (Month)     27 months            
Financing Receivable, Allowance for Credit Loss, Ending Balance $ 185,580,000 $ 140,282,000 $ 185,580,000 $ 140,282,000 $ 185,580,000 155,041,000   $ 127,842,000  
Finance Receivables, Allowance, Percent of Principle Balance 26.50%   26.50%   26.50%   24.50% 25.00%  
Finance Receivable Principal Balance $ 744,521,000 607,537,000 $ 744,521,000 607,537,000 $ 744,521,000 621,182,000      
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     23.30% 21.30%          
Tax Adjustments, Settlements, and Unusual Provisions     $ 672,000 $ 1,300,000          
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 2,352,000 2,596,000 2,352,000 2,596,000 2,352,000 3,082,000      
Late Fee Income Generated by Servicing Financial Assets, Amount     1,700,000 1,500,000          
Contract with Customer, Liability, Revenue Recognized     10,300,000            
Income Tax Expense (Benefit), Total 5,867,000 $ 2,981,000 $ 18,396,000 11,379,000          
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     $ 672,000 $ 1,300,000          
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 28,786,000   $ 28,786,000   28,786,000 24,480,000      
Service Contract [Member]                  
Contract with Customer, Liability, Total $ 15,431,000   15,431,000   $ 15,431,000 $ 11,641,000      
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%