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Note B - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended 18 Months Ended
May 31, 2016
May 30, 2016
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Apr. 30, 2019
Jan. 31, 2020
May 01, 2019
Apr. 30, 2018
Number of Reportable Segments         1          
Average Finance Receivable Interest Rate         16.40%          
Interest Receivable     $ 2,603   $ 2,603   $ 2,348 $ 2,603    
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     3.60% 3.20% 3.60% 3.20%   3.60%    
Financing Receivable, Weighted Average Total Contract Term         2 years 255 days          
Financing Receivable, Remaining Contract Term         1 year 348 days          
Financing Receivable, Allowance for Credit Loss, Ending Balance     $ 140,282 $ 127,980 $ 140,282 $ 127,980 127,842 $ 140,282   $ 117,821
Finance Receivables, Allowance, Percent of Principle Balance     24.50%   24.50%     24.50%    
Finance Receivable Principal Balance     $ 607,537 542,893 $ 607,537 $ 542,893 543,328 $ 607,537    
Percent of Chargeoffs in the First 10 to 11 Months of a Contract     50.00%   50.00%     50.00%    
Average Age of Account at Charge-Off Date               1 year 21 days    
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, Total         21.30% 20.40%        
Tax Adjustments, Settlements, and Unusual Provisions         $ 1,300 $ 1,500        
Income Tax Examination, Penalties and Interest Accrued, Total     0   0   0 0    
Contract with Customer, Liability, Revenue Recognized         9,400          
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due     2,596 1,493 2,596 1,493 1,187 2,596    
Late Fee Income Generated by Servicing Financial Assets, Amount         1,500 1,500        
Income Tax Expense (Benefit), Total     2,981 $ 3,381 $ 11,379 8,464        
Treasury Stock Shares to Establish Reserve Account to Secure Service Contracts         10,000          
Liabilities, Total     305,723   $ 305,723   231,632 305,723    
Assets, Total     597,893   $ 597,893   492,542 597,893    
ACM Insurance Company [Member]                    
Treasury Stock, Shares to Establish Reserve Account to Meet Regulatory Requirements for Insurance Company         14,000          
Accounting Standards Update 2016-09 [Member]                    
Income Tax Expense (Benefit), Total         $ 1,300 $ 1,500        
Accounting Standards Update 2016-02 [Member]                    
Liabilities, Total                 $ 34,500  
Assets, Total                 $ 34,500  
Payment Protection Plan [Member]                    
Contract with Customer, Liability, Total     23,566   23,566   21,367 23,566    
Service Contract [Member]                    
Contract with Customer, Liability, Total     $ 11,392   $ 11,392   $ 10,592 $ 11,392    
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         $ 50,000          
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%          
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Arkansas, USA [Member]                    
Concentration Risk, Percentage         28.00%