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Note B - Summary of Significant Accounting Policies (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
May 31, 2016
May 30, 2016
Oct. 31, 2016
Apr. 30, 2018
Oct. 24, 2017
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Number of Reportable Segments             1    
Line of Credit Facility, Distribution Limitations, Maximum Aggregate Amount of Stock Repurchases       $ 50,000,000 $ 40        
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%    
Financing Receivable Interest Rate             16.30%    
Interest Earned on Financing Receivables             $ 2,200,000 $ 2,100,000  
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       3.50%     3.50% 3.60%  
Financing Receivable, Average Days Past Due At Charge Off             60 days    
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    
Finance Receivables, Allowance, Percent of Principle Balance     25.00% 25.00%     25.00%    
Financing Receivable, Allowance for Credit Losses, Write-downs     $ 4,800,000            
Payment Protection Plan Liability, Anticipated Losses in Excess of Deferred Revenues       $ 0     $ 0 $ 0  
Goodwill, Impairment Loss             $ 0 $ 0  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent             30.40% 35.00%  
Tax Adjustments, Settlements, and Unusual Provisions             $ (8,100,000)    
Income Tax Examination, Penalties and Interest Accrued, Total       0     0 $ 0  
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due       $ 1,604,000     1,604,000 1,470,000  
Late Fee Income Generated by Servicing Financial Assets, Amount             1,900,000 2,000,000 $ 2,000,000
Advertising Expense             $ 3,800,000 4,000,000 4,200,000
Defined Contribution Plan, Employer Matching Contribution, Percent of Match             50.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay             4.00%    
Defined Contribution Plan, Employer Discretionary Contribution Amount             $ 465,000 437,000 403,000
Income Tax Expense (Benefit), Total             $ 2,397,000 $ 12,037,000 $ 6,902,000
Stock Repurchased During Period, Shares             979,040 666,202 493,073
Stock Repurchased During Period, Value             $ 42,300,000 $ 20,500,000 $ 14,200,000
Treasury Stock, Shares to Establish Reserve Account to Secure Service Contracts               10,000 10,000
Accounting Standards Update 2016-09 [Member]                  
Income Tax Expense (Benefit), Total             $ (1,700,000)    
2006 Employee Stock Purchase Plan [Member]                  
Common Stock Discount on Shares Percentage       15.00%     15.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       200,000     200,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       144,790     144,790    
Scenario, Forecast [Member]                  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent           21.00%      
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    
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Arkansas, USA [Member]                  
Concentration Risk, Percentage             30.00%