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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
Oct. 31, 2017
May 31, 2016
May 30, 2016
Jan. 31, 2018
Jan. 31, 2018
Jan. 31, 2017
Oct. 24, 2017
Jan. 31, 2018
Jan. 31, 2017
Apr. 30, 2019
Apr. 30, 2018
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     $ 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               16.20%          
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% 4.70%   4.10% 4.70%        
Financing Receivable, Average Days Past Due At Charge Off               64 days          
Financing Receivable, Weighted Average Contractual Term               2 years 252 days          
Financing Receivable, Weighted Average Remaining Contractual Term               1 year 333 days          
Financing Receivable, Allowance for Credit Losses       $ 117,268,000 $ 117,268,000 $ 111,818,000   $ 117,268,000 $ 111,818,000     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       $ 497,652,000 $ 497,652,000 475,354,000   $ 497,652,000 $ 475,354,000     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               (4.30%) 37.30%        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent               33.00%       35.00%  
Tax Adjustments, Settlements, and Unusual Provisions         (8,100,000)                
Income Tax Examination, Penalties and Interest Accrued       0 0     $ 0       $ 0  
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due       1,649,000 1,649,000 2,037,000   1,649,000 $ 2,037,000     1,470,000  
Late Fee Income Generated by Servicing Financial Assets, Amount               1,400,000 1,400,000        
Income Tax Expense (Benefit)         (7,556,000) $ 1,687,000   (1,095,000) 8,901,000        
Net Cash Provided by (Used in) Operating Activities               (5,131,000) (8,639,000)        
Net Cash Provided by (Used in) Financing Activities               $ 6,529,000 $ 8,791,000        
Stock Repurchased During Period, Shares               651,490 300,838        
Stock Repurchased During Period, Value               $ 26,300,000 $ 8,200,000        
Treasury Stock, Shares to Establish Reserve Account to Secure Service Contracts               10,000          
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability         (8,100,000)                
Accounting Standards Update 2016-09 [Member]                          
Income Tax Expense (Benefit)               $ (777,000)          
Net Cash Provided by (Used in) Operating Activities               777,000          
Net Cash Provided by (Used in) Financing Activities               (777,000)          
Scenario, Forecast [Member]                          
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent                   21.00% 30.40%    
Payment Protection Plan [Member]                          
Deferred Revenue       18,908,000 18,908,000     18,908,000       18,472,000  
Service Contract [Member]                          
Deferred Revenue       $ 9,672,000 $ 9,672,000     $ 9,672,000       $ 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%