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Note B - Summary of Significant Accounting Policies (Details Textual)
 1 Months Ended 7 Months Ended 12 Months Ended
Dec. 31, 2022
Nov. 30, 2022
Apr. 30, 2023
USD ($)
shares
Apr. 30, 2022
USD ($)
shares
Apr. 30, 2021
USD ($)
shares
Statement [Line Items]          
Number of Reportable Segments     1    
Average Finance Receivable Interest Rate     16.70%    
Financing Receivable Interest Rate 18.00% 16.50% 18.00%    
Interest Receivable     $ 6,115,000 $ 4,926,000  
Finance Receivables, Customer Payments Due Either Weekly or Bi-Weekly, Percentage     79.00%    
Financing Receivable, Greater Than or Equal to 30 Days Past Due, Percent of Portfolio     3.60% 3.00%  
Average Age of Account at Charge-Off Date (Year)     12 years 3 months 18 days    
Goodwill, Impairment Loss     $ 0 $ 0  
Goodwill, Ending Balance     11,716,000 8,623,000  
Goodwill, Period Increase (Decrease)     3,100,000    
Income Tax Examination, Penalties and Interest Accrued, Total     0 0  
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due     3,900,000 3,000,000.0  
Late Fee Income Generated by Servicing Financial Assets, Amount     4,400,000 3,100,000 $ 2,500,000
Contract with Customer, Liability, Revenue Recognized     26,800,000 16,500,000  
Advertising Expense     $ 5,800,000 5,000,000.0 2,900,000
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     $ 1,200,000 1,200,000 $ 908,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | shares     260,000    
Tax Adjustments, Settlements, and Unusual Provisions     $ 558,000 $ 1,400,000  
Stock Repurchased During Period, Shares (in shares) | shares     57,856 304,204 106,590
Stock Repurchased During Period, Value     $ 5,200,000 $ 34,700,000 $ 10,600,000
Treasury Stock Shares to Establish Reserve Account to Secure Service Contracts (in shares) | shares     10,000    
Operating Lease, Weighted Average Remaining Lease Term (Year)     12 years 10 months 24 days    
Operating Lease, Weighted Average Discount Rate, Percent     4.40%    
ACM Insurance Company [Member]          
Statement [Line Items]          
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]          
Statement [Line Items]          
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     129,254    
Implementation Costs for Cloud Computing Arrangements [Member]          
Statement [Line Items]          
Capitalized Contract Cost, Net     $ 9,000,000.0 6,000,000.0  
Capitalized Contract Cost, Accumulated Amortization     $ 136,709 $ 50,888  
Minimum [Member]          
Statement [Line Items]          
Lessee, Operating Lease, Term of Contract (Year)     3 years    
Lessee, Operating Lease, Renewal Term (Year)     3 years    
Maximum [Member]          
Statement [Line Items]          
Lessee, Operating Lease, Term of Contract (Year)     10 years    
Lessee, Operating Lease, Renewal Term (Year)     10 years    
Revolving Credit Facility [Member]          
Statement [Line Items]          
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%    
ARKANSAS          
Statement [Line Items]          
Financing Receivable Interest Rate 16.50%   17.00%    
ILLINOIS | Minimum [Member]          
Statement [Line Items]          
Financing Receivable Interest Rate 19.50%   19.50%    
ILLINOIS | Maximum [Member]          
Statement [Line Items]          
Financing Receivable Interest Rate 21.50%   21.50%    
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Arkansas, USA [Member]          
Statement [Line Items]          
Concentration Risk, Percentage     28.00%