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Note B - Summary of Significant Accounting Policies (Details Textual) - USD ($)
 9 Months Ended 12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Apr. 30, 2015
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    
Payment Protection Plan [Member]      
Deferred Revenue $ 16,714,000   $ 15,652,000
Service Contract [Member]      
Deferred Revenue 9,673,000   9,584,000
Interest Earned on Financing Receivables 2,000,000   2,000,000
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%    
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 5.00% 5.20%  
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 351 days    
Financing Receivable, Allowance for Credit Losses, Write-downs $ 104,200,000    
Accounts Receivable, Allowance for Credit Losses, Percentage 25.00%    
Finance Receivable Principal Balance $ 443,296,000 $ 425,076,000 417,368,000
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due 2,131,000 2,364,000 $ 2,795,000
Late Fee Income Generated by Servicing Financial Assets, Amount $ 1,500,000 $ 1,700,000  
Stock Repurchased During Period, Shares 342,171 321,675  
Stock Repurchased During Period, Value $ 10,500,000 $ 13,600,000  
Treasury Stock, Shares to Establish Reserve Account to Secure Service Contracts 10,000