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Note B - Summary of Significant Accounting Policies (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2016
Oct. 31, 2015
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Financing Receivable, Allowance for Credit Losses, Write-downs   $ 4,800,000      
Payment Protection Plan Liability, Anticipated Losses in Excess of Deferred Revenues     $ 0 $ 0  
Goodwill, Impairment Loss     0 0  
Income Tax Examination, Penalties and Interest Accrued     0 0  
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due     1,470,000 1,089,000  
Late Fee Income Generated by Servicing Financial Assets, Amount     2,000,000 2,000,000 $ 2,200,000
Advertising Expense     $ 4,000,000 4,200,000 3,600,000
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     $ 437,000 $ 403,000 $ 363,000
Stock Repurchased During Period, Shares     666,202 493,073 442,700
Stock Repurchased During Period, Value     $ 20,500,000 $ 14,200,000 $ 20,000,000
Treasury Stock, Shares to Establish Reserve Account to Secure Service Contracts       10,000  
Treasury Stock, Shares to Establish Reserve Account for Subsidiaries     10,000    
Number of Reportable Segments     1    
Line of Credit Facility,Distribution Limitations Maximum Aggregate Amount of Stock Repurchases     $ 40,000,000    
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases     25.00%    
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     15.90%    
Interest Earned on Financing Receivables     $ 2,100,000 $ 1,700,000  
Finance Receivables, Customer Payments Due Either Weekly or Bi-Weekly, Percentage     74.00%    
Financing Receivable, Greater Than or Equal to 30 Days Past Due, Percent of Portfolio     3.60% 3.00%  
Financing Receivable, Average Days Past Due At Charge Off     60 days    
Percentage of Receivable Charge-Offs     50.00%    
Average Age of Account at Charge-Off Date     357 days    
Finance Receivables, Allowance, Percent of Principle Balance     25.00%    
2006 Employee Stock Purchase Plan [Member]          
Common Stock Discount on Shares Percentage     15.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     200,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     147,886    
Maximum [Member]          
Financing Receivable Interest Rate 16.50%   16.50% 15.00%  
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%