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Note B - Summary of Significant Accounting Policies (Details Textual) - USD ($)
 6 Months Ended 18 Months Ended
May 31, 2016
May 30, 2016
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2019
Apr. 30, 2019
Apr. 30, 2018
Number of Reportable Segments     1        
Average Finance Receivable Interest Rate     16.40%        
Interest Receivable     $ 2,728,000   $ 2,728,000 $ 2,348,000  
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     3.50% 3.40% 3.50%    
Financing Receivable, Weighted Average Total Contract Term     2 years 249 days        
Financing Receivable, Remaining Contract Term     1 year 342 days        
Financing Receivable, Allowance for Credit Loss, Ending Balance     $ 135,481,000 $ 126,128,000 $ 135,481,000 127,842,000 $ 117,821,000
Finance Receivables, Allowance, Percent of Principle Balance     24.50%   24.50%    
Finance Receivable Principal Balance     $ 587,087,000 535,842,000 $ 587,087,000 543,328,000  
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         1 year 21 days    
Payment Protection Plan Liability, Anticipated Losses in Excess of Deferred Revenues     $ 0   $ 0 0  
Goodwill, Impairment Loss     $ 0 $ 0      
Effective Income Tax Rate Reconciliation, Percent, Total     22.20% 18.70%      
Tax Adjustments, Settlements, and Unusual Provisions     $ 415,000 $ 1,500,000      
Income Tax Examination, Penalties and Interest Accrued, Total     0   0 0  
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due     2,226,000 1,512,000 2,226,000 1,187,000  
Late Fee Income Generated by Servicing Financial Assets, Amount     980,000 $ 933,000      
Contract with Customer, Liability, Revenue Recognized     $ 8,400,000        
Treasury Stock Shares to Establish Reserve Account to Secure Service Contracts     10,000        
Liabilities, Total     $ 296,608,000   296,608,000 231,632,000  
Assets, Total     575,367,000   575,367,000 492,542,000  
Accounting Standards Update 2016-02 [Member]              
Liabilities, Total     34,500,000   34,500,000    
Assets, Total     $ 34,500,000   34,500,000    
ACM Insurance Company [Member]              
Treasury Stock, Shares to Establish Reserve Account to Meet Regulatory Requirements for Insurance Company     14,000        
Payment Protection Plan [Member]              
Contract with Customer, Liability, Total     $ 22,836,000   22,836,000 21,367,000  
Service Contract [Member]              
Contract with Customer, Liability, Total     $ 11,265,000   $ 11,265,000 $ 10,592,000  
Maximum [Member]              
Financing Receivable Interest Rate 16.50% 15.00% 16.50%        
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period     5 years        
Minimum [Member]              
Financing Receivable Interest Rate     15.00%        
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period     1 year        
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%