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Note B - Summary of Significant Accounting Policies (Details Textual)
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2022
USD ($)
Jan. 31, 2021
USD ($)
Jan. 31, 2022
USD ($)
shares
Jan. 31, 2021
USD ($)
Apr. 30, 2021
USD ($)
Apr. 30, 2022
USD ($)
Apr. 30, 2020
USD ($)
Number of Reportable Segments     1        
Average Finance Receivable Interest Rate     16.50%        
Interest Receivable $ 4,220,000   $ 4,220,000   $ 3,367,000    
Finance Receivables, Customer Payments Due Either Weekly or Bi-Weekly, Percentage     75.00%        
Financing Receivable, Greater Than or Equal to 30 Days Past Due, Percent of Portfolio 4.00%   4.00%   2.60%    
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period (Year)     77 years 59 years      
Financing Receivable, Weighted Average Total Contract Term (Month)     41 months 6 days        
Financing Receivable, Remaining Contract Term (Month)     32 months 12 days        
Financing Receivable, Allowance for Credit Loss, Ending Balance $ 231,966,000 $ 185,580,000 $ 231,966,000 $ 185,580,000 $ 184,418,000   $ 155,041,000
Finance Receivables, Allowance, Percent of Principle Balance 24.50%   24.50%        
Finance Receivable, Principal Balance $ 1,029,203,000 744,521,000 $ 1,029,203,000 $ 744,521,000 809,537,000    
Percent of Chargeoffs in the First 10 to 11 Months of a Contract 50.00%   50.00%        
Average Age of Account at Charge-Off Date (Month)     12 months 15 days        
Goodwill, Impairment Loss         0    
Effective Income Tax Rate Reconciliation, Percent, Total     22.60% 23.30%      
Tax Adjustments, Settlements, and Unusual Provisions     $ 912,000 $ 672,000      
Income Tax Examination, Penalties and Interest Accrued, Total $ 0   0     $ 0  
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due 5,200,000 2,400,000 5,200,000 2,400,000      
Late Fee Income Generated by Servicing Financial Assets, Amount     2,200,000 1,700,000      
Contract with Customer, Liability, Revenue Recognized     14,600,000        
Income Tax Expense (Benefit), Total 6,024,000 $ 5,867,000 $ 19,433,000 18,396,000      
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     $ 912,000 $ 672,000      
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        
Accident Protection Plan [Member]              
Contract with Customer, Liability, Total 40,200,000   $ 40,200,000        
Service Contract [Member]              
Contract with Customer, Liability, Total $ 42,169,000   42,169,000   $ 24,106,000    
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%        
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Arkansas, USA [Member]              
Concentration Risk, Percentage     27.60%