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Note B - Summary of Significant Accounting Policies (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 30, 2016
Oct. 31, 2016
Oct. 31, 2016
Oct. 31, 2015
Apr. 30, 2016
Apr. 30, 2015
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Arkansas, USA [Member]            
Concentration Risk, Percentage     30.00%      
Maximum [Member]            
Financing Receivable Interest Rate 16.50%   16.50%   15.50%  
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      
Payment Protection Plan [Member]            
Deferred Revenue   $ 18,475,000 $ 18,475,000   $ 17,304,000  
Service Contract [Member]            
Deferred Revenue   10,470,000 10,470,000   10,035,000  
Payment Protection Plan Liability, Anticipated Losses in Excess of Deferred Revenues   0 $ 0   0  
Number of Reportable Segments     1      
Goodwill, Impairment Loss     $ 0   0  
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%      
Income Tax Examination, Penalties and Interest Accrued   $ 0 $ 0   0  
Interest Earned on Financing Receivables     $ 2,300,000   1,700,000  
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   4.80% 4.80% 3.50%    
Financing Receivable, Average Days Past Due At Charge Off   60 days        
Financing Receivable, Weighted Average Contractual Term     2 years 231 days      
Financing Receivable, Weighted Average Remaining Contractual Term     1 year 336 days      
Financing Receivable, Allowance for Credit Losses   $ 111,340,000 $ 111,340,000 $ 100,434,000 102,485,000 $ 93,224,000
Finance Receivables, Percent of Principle Balance, Net Deferred Revenue   25.00% 25.00%      
Finance Receivable Principal Balance   $ 474,295,000 $ 474,295,000 427,663,000 437,278,000  
Percentage of Receivable Charge-Offs   50.00% 50.00%      
Average Age of Account at Charge-Off Date     357 days      
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due   $ 1,842,000 $ 1,842,000 1,677,000 $ 1,089,000  
Late Fee Income Generated by Servicing Financial Assets, Amount     $ 954,000 $ 996,000    
Stock Repurchased During Period, Shares     297,693 89,658    
Stock Repurchased During Period, Value     $ 8,100,000 $ 4,000,000    
Treasury Stock, Shares to Establish Reserve Account to Secure Service Contracts         10,000