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Note B - Summary of Significant Accounting Policies (Details Textual) - USD ($)
 3 Months Ended 12 Months Ended 18 Months Ended
May 31, 2016
May 30, 2016
Jul. 31, 2017
Jul. 31, 2016
Apr. 30, 2017
Jul. 31, 2017
Apr. 30, 2016
Goodwill, Impairment Loss     $ 0 $ 0      
Effective Income Tax Rate Reconciliation, Percent     35.80% 37.30%      
Income Tax Expense (Benefit)     $ 3,897,000 $ 4,229,000      
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due     2,028,000 1,668,000 $ 1,470,000 $ 2,028,000  
Late Fee Income Generated by Servicing Financial Assets, Amount     $ 449,000 $ 461,000      
Stock Repurchased During Period, Shares     102,843 273,092      
Stock Repurchased During Period, Value     $ 3,700,000 $ 7,200,000      
Treasury Stock, Shares to Establish Reserve Account to Secure Service Contracts     10,000        
Income Tax Examination, Penalties and Interest Accrued     $ 0   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     25.00%        
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%        
Financing Receivable Interest Rate     16.00%        
Interest Earned on Financing Receivables     $ 2,300,000   2,100,000    
Finance Receivables, Customer Payments Due Either Weekly or Bi-Weekly, Percentage     74.00%        
Financing Receivable, Greater Than or Equal to 30 Days Past Due, Percent of Portfolio     4.60% 4.40%   4.60%  
Financing Receivable, Average Days Past Due At Charge Off     61 days        
Financing Receivable, Weighted Average Contractual Term     2 years 258 days        
Financing Receivable, Weighted Average Remaining Contractual Term     1 year 351 days        
Financing Receivable, Allowance for Credit Losses     $ 113,733,000 $ 108,022,000 109,693,000 $ 113,733,000 $ 102,485,000
Finance Receivables, Percent of Principle Balance, Net Deferred Revenue     25.00%     25.00%  
Finance Receivable Principal Balance     $ 483,719,000 $ 460,570,000 466,854,000 $ 483,719,000  
Percentage of Receivable Charge-Offs     50.00%     50.00%  
Average Age of Account at Charge-Off Date           357 days  
Payment Protection Plan Liability, Anticipated Losses in Excess of Deferred Revenues     $ 0   0 $ 0  
Accounting Standards Update 2016-09 [Member]              
Income Tax Expense (Benefit)     (172,000)        
Payment Protection Plan [Member]              
Deferred Revenue     18,888,000   18,472,000 18,888,000  
Service Contract [Member]              
Deferred Revenue     $ 9,901,000   $ 9,611,000 $ 9,901,000  
Maximum [Member]              
Financing Receivable Interest Rate 16.50% 15.00% 16.50%        
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        
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Arkansas, USA [Member]              
Concentration Risk, Percentage     30.00%