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Note B - Summary of Significant Accounting Policies (Details Textual)
 3 Months Ended 12 Months Ended
Jul. 31, 2020
USD ($)
shares
Jul. 31, 2019
USD ($)
Apr. 30, 2020
USD ($)
Apr. 30, 2019
USD ($)
Number of Reportable Segments 1      
Average Finance Receivable Interest Rate 16.40%      
Interest Receivable $ 2,671,000   $ 3,098,000  
Finance Receivables, Customer Payments Due Either Weekly or Bi-Weekly, Percentage 76.00%      
Financing Receivable, Greater Than or Equal to 30 Days Past Due, Percent of Portfolio 2.60% 3.80%    
Financing Receivable, Weighted Average Total Contract Term (Month) 33 months 27 days 24 months 27 days    
Financing Receivable, Allowance for Credit Loss, Ending Balance $ 160,807,000 $ 129,494,000 155,041,000 $ 127,842,000
Finance Receivables, Allowance, Percent of Principle Balance 26.50% 24.50%   25.00%
Finance Receivable Principal Balance $ 643,335,000 $ 561,104,000 621,182,000  
Percent of Chargeoffs in the First 10 to 11 Months of a Contract 50.00%      
Average Age of Account at Charge-Off Date (Month) 12 months 24 days      
Goodwill, Impairment Loss $ 0   0  
Effective Income Tax Rate Reconciliation, Percent, Total 23.40% 21.80%    
Tax Adjustments, Settlements, and Unusual Provisions $ 91,000 $ 276,000    
Open Tax Year 2017 2018 2019 2020      
Income Tax Examination, Penalties and Interest Accrued, Total $ 0   0  
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due 2,252,000 1,965,000 3,082,000  
Late Fee Income Generated by Servicing Financial Assets, Amount 511,000 485,000    
Contract with Customer, Liability, Revenue Recognized 5,900,000      
Income Tax Expense (Benefit), Total $ 5,975,000 4,328,000    
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 $ 91,000 $ 276,000    
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 $ 24,878,000   24,480,000  
Service Contract [Member]        
Contract with Customer, Liability, Total 11,637,000   $ 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 29.00%