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Note B - Summary of Significant Accounting Policies (Details Textual) | 12 Months Ended
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Apr. 30, 2022 USD ($) shares | Apr. 30, 2021 USD ($) shares | Apr. 30, 2020 USD ($) shares
Number of Reportable Segments | 1 |  |
Average Finance Receivable Interest Rate | 16.50% |  |
Interest Receivable | $ 4,926,000 | $ 3,367,000 |
Finance Receivables, Customer Payments Due Either Weekly or Bi-Weekly, Percentage | 78.00% |  |
Financing Receivable, Greater Than or Equal to 30 Days Past Due, Percent of Portfolio | 3.00% | 2.60% |
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period (Year) | 75 years |  |
Percent of Chargeoffs in the First 10 to 11 Months of a Contract | 50.00% |  |
Average Age of Account at Charge-Off Date (Year) | 12 years |  |
Goodwill, Impairment Loss | $ 0 | $ 0 |
Goodwill, Ending Balance | 8,623,000 | 7,280,000 |
Goodwill, Period Increase (Decrease), Total | 1,300,000 |  |
Income Tax Examination, Penalties and Interest Accrued, Total | 0 |  |
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due | 3,000,000.0 | 2,100,000 |
Late Fee Income Generated by Servicing Financial Assets, Amount | 3,100,000 | 2,500,000 | $ 2,300,000
Contract with Customer, Liability, Revenue Recognized | 16,500,000 | 10,300,000 |
Advertising Expense | $ 5,000,000.0 | 2,900,000 | 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 | $ 1,200,000 | $ 908,000 | $ 769,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | shares | 215,000 |  |
Stock Repurchased During Period, Shares (in shares) | shares | 304,204 | 106,590 | 182,805
Stock Repurchased During Period, Value | $ 34,700,000 | $ 10,600,000 | $ 16,000,000.0
Treasury Stock Shares to Establish Reserve Account to Secure Service Contracts (in shares) | shares | 10,000 |  |
Operating Lease, Weighted Average Remaining Lease Term (Year) | 13 years 9 months 18 days |  |
Operating Lease, Weighted Average Discount Rate, Percent | 4.33% |  |
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 | 133,621 |  |
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 | 27.40% |  |

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