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Note B - Summary of Significant Accounting Policies (Details Textual) - USD ($)
 6 Months Ended 12 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Apr. 30, 2015
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Arkansas, USA [Member]      
Concentration Risk, Percentage 32.00%    
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]      
Financing Receivable Interest Rate 14.00%    
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period 1 year    
Payment Protection Plan [Member]      
Deferred Revenue $ 16,061,000   $ 15,652,000
Service Contract [Member]      
Deferred Revenue 9,865,000   9,584,000
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 3.50% 4.40%  
Financing Receivable, Average Days Past Due At Charge Off 59 days    
Percentage of Receivable Charge-Offs 50.00%    
Financing Receivable, Allowance for Credit Losses, Write-downs $ 100,400,000    
Accounts Receivable, Allowance for Credit Losses, Percentage 25.00%    
Finance Receivable Principal Balance $ 427,663,000 $ 411,500,000 417,368,000
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due 1,677,000 1,967,000 $ 2,795,000
Late Fee Income Generated by Servicing Financial Assets, Amount $ 996,000 $ 1,100,000  
Stock Repurchased During Period, Shares 89,658 255,208  
Stock Repurchased During Period, Value $ 4,000,000 $ 10,300,000