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Note B - Summary of Significant Accounting Policies (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2017
May 31, 2016
May 30, 2016
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2017
Oct. 24, 2017
Oct. 31, 2016
Apr. 30, 2017
Apr. 30, 2016
Number of Reportable Segments           1        
Line of Credit Facility, Distribution Limitations, Maximum Aggregate Amount of Stock Repurchases $ 50,000,000           $ 40,000,000      
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases           20.00%        
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           16.10%        
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 4.10%     4.10% 4.80% 4.10%   4.80%    
Financing Receivable, Average Days Past Due At Charge Off           63 days        
Financing Receivable, Weighted Average Contractual Term           2 years 255 days        
Financing Receivable, Weighted Average Remaining Contractual Term           1 year 339 days        
Financing Receivable, Allowance for Credit Losses $ 115,918,000     $ 115,918,000 $ 111,340,000 $ 115,918,000   $ 111,340,000 109,693,000 $ 102,485,000
Finance Receivables, Percent of Principle Balance, Net Deferred Revenue 25.00%     25.00%   25.00%        
Finance Receivable Principal Balance $ 492,495,000     $ 492,495,000 474,295,000 $ 492,495,000   $ 474,295,000 466,854,000  
Percentage of Receivable Charge-Offs 50.00%     50.00%   50.00%        
Payment Protection Plan Liability, Anticipated Losses in Excess of Deferred Revenues $ 0     $ 0   $ 0     0  
Goodwill, Impairment Loss           $ 0     0  
Effective Income Tax Rate Reconciliation, Percent           33.30%   37.30%    
Income Tax Expense (Benefit)       2,564,000 2,985,000 $ 6,461,000   $ 7,214,000    
Income Tax Examination, Penalties and Interest Accrued 0     0   0     0  
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due 1,845,000     1,845,000 $ 1,842,000 1,845,000   1,842,000 1,470,000  
Late Fee Income Generated by Servicing Financial Assets, Amount           903,000   954,000    
Net Cash Provided by (Used in) Operating Activities           (1,154,000)   (9,942,000)    
Net Cash Provided by (Used in) Financing Activities           $ 2,013,000   $ 10,381,000    
Stock Repurchased During Period, Shares           509,773   297,693    
Stock Repurchased During Period, Value           $ 20,100,000   $ 8,100,000    
Treasury Stock, Shares to Establish Reserve Account to Secure Service Contracts           10,000        
Accounting Standards Update 2016-09 [Member]                    
Income Tax Expense (Benefit)           $ (784,000)        
Net Cash Provided by (Used in) Operating Activities           784,000        
Net Cash Provided by (Used in) Financing Activities           (784,000)        
Payment Protection Plan [Member]                    
Deferred Revenue 18,956,000     18,956,000   18,956,000     18,472,000  
Service Contract [Member]                    
Deferred Revenue $ 9,868,000     $ 9,868,000   $ 9,868,000     $ 9,611,000  
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%