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Note B - Summary of Significant Accounting Policies (Details Textual) - USD ($)
 3 Months Ended 12 Months Ended
Oct. 31, 2015
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Arkansas, USA [Member]        
Concentration Risk, Percentage   31.00%    
Maximum [Member]        
Financing Receivable Interest Rate   15.00%    
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period   5 years    
Minimum [Member]        
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period   1 year    
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   152,636    
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  
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   30.00%    
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%    
Interest Earned on Financing Receivables   $ 1,700,000 $ 2,000,000  
Finance Receivables, Customer Payments Due Either Weekly or Bi-Weekly, Percentage   73.00%    
Financing Receivable, Greater Than or Equal to 30 Days Past Due, Percent of Portfolio   3.00% 5.80%  
Financing Receivable, Average Days Past Due At Charge Off   62 days    
Percentage of Receivable Charge-Offs   50.00%    
Average Age of Account at Charge-Off Date   11 years 255 days    
Financing Receivable, Allowance for Credit Losses, Write-downs $ 4,800,000      
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due   $ 1,089,000 $ 2,795,000  
Late Fee Income Generated by Servicing Financial Assets, Amount   2,000,000 2,200,000 $ 2,200,000
Advertising Expense   $ 4,200,000 3,600,000 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   $ 403,000 $ 363,000 $ 329,000
Stock Repurchased During Period, Shares   493,073 442,700 325,598
Stock Repurchased During Period, Value   $ 14,200,000 $ 20,000,000 $ 12,800,000
Treasury Stock, Shares to Establish Reserve Account to Secure Service Contracts   10,000