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Note B - Summary of Significant Accounting Policies (Details Textual)
 3 Months Ended 12 Months Ended
Apr. 30, 2020
USD ($)
$ / shares
Apr. 30, 2021
USD ($)
$ / shares
shares
Apr. 30, 2020
USD ($)
shares
Apr. 30, 2019
USD ($)
shares
Jan. 31, 2020
Jul. 31, 2019
May 01, 2019
Number of Reportable Segments   1          
Average Finance Receivable Interest Rate   16.50%          
Interest Receivable $ 3,098,000 $ 3,367,000 $ 3,098,000        
Finance Receivables, Customer Payments Due Either Weekly or Bi-Weekly, Percentage   77.00%          
Financing Receivable, Greater Than or Equal to 30 Days Past Due, Percent of Portfolio 6.20% 2.60% 6.20%        
Percent of Chargeoffs in the First 10 to 11 Months of a Contract   50.00%          
Average Age of Account at Charge-Off Date (Month)   13 months          
Finance Receivables, Allowance, Percent of Principle Balance         24.50% 24.50% 25.00%
Financing Receivable, Percent Past Due         2.90%    
Payment Protection Plan Liability, Anticipated Losses in Excess of Deferred Revenues $ 0 $ 0 $ 0        
Goodwill, Impairment Loss   0 0        
Income Tax Examination, Penalties and Interest Accrued, Total 0 0 0        
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due $ 3,100,000 2,100,000 3,100,000        
Late Fee Income Generated by Servicing Financial Assets, Amount   2,500,000 2,300,000 $ 1,900,000      
Contract with Customer, Liability, Revenue Recognized   10,300,000 9,400,000        
Advertising Expense   $ 2,900,000 3,100,000 3,100,000      
Defined Contribution Plan, Employer Matching Contribution, Percent of Match   50.00%          
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay   6.00%          
Defined Contribution Plan, Employer Contribution Amount   $ 908,000 $ 769,000 $ 523,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | shares   245,000          
Stock Repurchased During Period, Shares (in shares) | shares   106,590 182,805 378,627      
Stock Repurchased During Period, Value   $ 10,600,000 $ 16,000,000.0 $ 26,600,000      
Treasury Stock Shares to Establish Reserve Account to Secure Service Contracts (in shares) | shares   10,000          
Operating Lease, Weighted Average Remaining Lease Term (Year)   14 years 4 months 24 days          
Operating Lease, Weighted Average Discount Rate, Percent   4.29%          
ACM Insurance Company [Member]              
Treasury Stock, Shares to Establish Reserve Account to Meet Regulatory Requirements for Insurance Company (in shares) | shares   14,000          
2006 Employee Stock Purchase Plan [Member]              
Common Stock Discount on Shares Percentage   15.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | shares   200,000          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | shares   136,842          
COVID-19 Pandemic [Member]              
Finance Receivables, Allowance, Percent of Principle Balance 26.50% 24.50% 26.50%        
Financing Receivable, Percent Past Due 6.20%   6.20%        
Provision for Loan, Lease, and Other Losses, Total $ 9,100,000 $ (15,100,000)          
Provision for Loan, Lease, and Other Losses, Net of Tax $ 7,000,000.0 $ (11,500,000)          
Provision for Loan, Lease, and Other Losses, Per Diluted Share (in dollars per share) | $ / shares $ 1.02 $ (1.65)          
Minimum [Member]              
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period (Year)   1 year          
Lessee, Operating Lease, Term of Contract (Year)   3 years          
Lessee, Operating Lease, Renewal Term (Year)   3 years          
Maximum [Member]              
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period (Year)   5 years          
Lessee, Operating Lease, Term of Contract (Year)   10 years          
Lessee, Operating Lease, Renewal Term (Year)   10 years          
Revolving Credit Facility [Member]              
Line of Credit Facility, Distribution Limitations, Maximum Aggregate Amount of Stock Repurchases   $ 50,000,000          
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%          
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Arkansas, USA [Member]              
Concentration Risk, Percentage   27.00%