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Note B - Summary of Significant Accounting Policies (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 15 Months Ended 21 Months Ended
Oct. 25, 2017
May 31, 2016
May 30, 2016
Jan. 31, 2019
Oct. 24, 2017
Jan. 31, 2019
Jan. 31, 2018
Apr. 30, 2019
Apr. 30, 2018
Jan. 31, 2019
Jan. 31, 2019
Apr. 30, 2017
Number of Reportable Segments           1            
Average Finance Receivable Interest Rate           16.40%            
Interest Receivable       $ 2,456,000   $ 2,456,000     $ 2,189,000 $ 2,456,000 $ 2,456,000  
Finance Receivables, Customer Payments Due Either Weekly or Bi-Weekly, Percentage           76.00%            
Financing Receivable, Greater Than or Equal to 30 Days Past Due, Percent of Portfolio       3.20%   3.20% 4.10%     3.20% 3.20%  
Financing Receivable, Average Days Past Due At Charge Off       63 days                
Financing Receivable, Weighted Average Total Contract Term           2 years 240 days            
Financing Receivable, Remaining Contract Term           1 year 324 days            
Financing Receivable, Allowance for Credit Losses, Ending Balance       $ 127,980,000   $ 127,980,000 $ 117,268,000   117,821,000 $ 127,980,000 $ 127,980,000 $ 109,693,000
Finance Receivables, Allowance, Percent of Principle Balance       25.00%   25.00%       25.00% 25.00%  
Finance Receivable Principal Balance       $ 542,893,000   $ 542,893,000 $ 497,652,000   501,438,000 $ 542,893,000 $ 542,893,000  
Deferred Revenue       $ 20,700,000   $ 20,700,000       $ 20,700,000 $ 20,700,000  
Percent of Chargeoffs in the First 10 to 11 Months of a Contract       50.00%   50.00%       50.00% 50.00%  
Average Age of Account at Charge-Off Date           1 year            
Payment Protection Plan Liability, Anticipated Losses in Excess of Deferred Revenues       $ 0   $ 0     0 $ 0 $ 0  
Goodwill, Impairment Loss           $ 0     $ 0      
Effective Income Tax Rate Reconciliation, Percent, Total           20.40% (4.30%)          
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability             $ (8,100,000)          
Tax Adjustments, Settlements, and Unusual Provisions           $ (1,500,000) (777,000)          
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent               21.00% 30.40%      
Income Tax Examination, Penalties and Interest Accrued, Total       0   0     $ 0 0 0  
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due       1,493,000   1,493,000 1,649,000   $ 1,604,000 1,493,000 1,493,000  
Late Fee Income Generated by Servicing Financial Assets, Amount           1,500,000 $ 1,400,000          
Contract with Customer, Liability, Revenue Recognized from Prior Year       910,000   $ 9,100,000            
Stock Repurchased During Period, Shares           347,155 651,490          
Stock Repurchased During Period, Value           $ 24,100,000 $ 26,300,000          
Treasury Stock Shares to Establish Reserve Account to Secure Service Contracts           10,000            
ACM Insurance Company [Member]                        
Treasury Stock, Shares to Establish Reserve Account to Meet Regulatory Requirements for Insurance Company           14,000            
Service Contract [Member]                        
Deferred Revenue       $ 10,200,000   $ 10,200,000       10,200,000 $ 10,200,000  
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            
Revolving Credit Facility [Member]                        
Line of Credit Facility, Distribution Limitations, Maximum Aggregate Amount of Stock Repurchases         $ 40,000,000         $ 50,000,000    
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases 20.00%       25.00% 20.00%         20.00%  
Line of Credit Facility, Distribution Limitations Percentage of Consolidated Net Income           75.00%         75.00%  
Line of Credit Facility Distribution Limitations Minimum Percentage of Aggregate Funds Available           12.50%         12.50%  
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Arkansas, USA [Member]                        
Concentration Risk, Percentage           28.00%