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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% |  |  |  |  |

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