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Note B - Summary of Significant Accounting Policies (Details) (USD $)
 6 Months Ended 12 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Apr. 30, 2014
Apr. 30, 2013
Note B - Summary of Significant Accounting Policies (Details) [Line Items]        
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 1,800,000   1,800,000  
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 4.40% 4.70%    
Financing Receivable, Average Days Past Due at Charge Off 68 days      
Percentage of Receivable Charge Offs 50.00%      
Average Age of Account At Charge-Off Date 11 months 12 days      
Financing Receivable, Allowance for Credit Losses 92,460,000 80,699,000 86,033,000 75,345,000
Accounts Receivable Allowance for Credit Losses Percentage 23.80%   23.50%  
Finance Receivable Principal Balance 411,500,000 388,799,000 379,332,000  
Goodwill, Impairment Loss 0   0  
Income Tax Examination, Penalties and Interest Accrued 0   0  
Late Fee Income Generated by Servicing Financial Assets, Amount 1,100,000 1,100,000    
Financing Receivable Recorded Investment Greater Than 90 Days Past Due 1,967,000 1,927,000 1,155,000  
Stock Repurchased During Period, Shares (in Shares) 255,208 12,620    
Stock Repurchased During Period, Value 10,300,000 531,000    
Payment Protection Plan [Member]
        
Note B - Summary of Significant Accounting Policies (Details) [Line Items]        
Deferred Revenue 14,376,000   13,233,000  
Service Contract [Member]
        
Note B - Summary of Significant Accounting Policies (Details) [Line Items]        
Deferred Revenue $ 8,635,000   $ 4,234,000  
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | ARKANSAS
        
Note B - Summary of Significant Accounting Policies (Details) [Line Items]        
Concentration Risk, Percentage 32.00%      
Minimum [Member]
        
Note B - Summary of Significant Accounting Policies (Details) [Line Items]        
Financing Receivable Interest Rate 11.00%      
Allowance for Credit Losses Primary Factor, Units Repossessed or Charged-off Evaluation Period 1 year      
Maximum [Member]
        
Note B - Summary of Significant Accounting Policies (Details) [Line Items]        
Financing Receivable Interest Rate 19.00%      
Allowance for Credit Losses Primary Factor, Units Repossessed or Charged-off Evaluation Period 5 years