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Note B - Summary of Significant Accounting Policies (Details Textual) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2022 USD ($) | Jan. 31, 2021 USD ($) | Jan. 31, 2022 USD ($) shares | Jan. 31, 2021 USD ($) | Apr. 30, 2021 USD ($) | Apr. 30, 2022 USD ($) | Apr. 30, 2020 USD ($)
Number of Reportable Segments |  |  | 1 |  |  |  |
Average Finance Receivable Interest Rate |  |  | 16.50% |  |  |  |
Interest Receivable | $ 4,220,000 |  | $ 4,220,000 |  | $ 3,367,000 |  |
Finance Receivables, Customer Payments Due Either Weekly or Bi-Weekly, Percentage |  |  | 75.00% |  |  |  |
Financing Receivable, Greater Than or Equal to 30 Days Past Due, Percent of Portfolio | 4.00% |  | 4.00% |  | 2.60% |  |
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period (Year) |  |  | 77 years | 59 years |  |  |
Financing Receivable, Weighted Average Total Contract Term (Month) |  |  | 41 months 6 days |  |  |  |
Financing Receivable, Remaining Contract Term (Month) |  |  | 32 months 12 days |  |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | $ 231,966,000 | $ 185,580,000 | $ 231,966,000 | $ 185,580,000 | $ 184,418,000 |  | $ 155,041,000
Finance Receivables, Allowance, Percent of Principle Balance | 24.50% |  | 24.50% |  |  |  |
Finance Receivable, Principal Balance | $ 1,029,203,000 | 744,521,000 | $ 1,029,203,000 | $ 744,521,000 | 809,537,000 |  |
Percent of Chargeoffs in the First 10 to 11 Months of a Contract | 50.00% |  | 50.00% |  |  |  |
Average Age of Account at Charge-Off Date (Month) |  |  | 12 months 15 days |  |  |  |
Goodwill, Impairment Loss |  |  |  |  | 0 |  |
Effective Income Tax Rate Reconciliation, Percent, Total |  |  | 22.60% | 23.30% |  |  |
Tax Adjustments, Settlements, and Unusual Provisions |  |  | $ 912,000 | $ 672,000 |  |  |
Income Tax Examination, Penalties and Interest Accrued, Total | $ 0 |  | 0 |  |  | $ 0 |
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due | 5,200,000 | 2,400,000 | 5,200,000 | 2,400,000 |  |  |
Late Fee Income Generated by Servicing Financial Assets, Amount |  |  | 2,200,000 | 1,700,000 |  |  |
Contract with Customer, Liability, Revenue Recognized |  |  | 14,600,000 |  |  |  |
Income Tax Expense (Benefit), Total | 6,024,000 | $ 5,867,000 | $ 19,433,000 | 18,396,000 |  |  |
Treasury Stock Shares to Establish Reserve Account to Secure Service Contracts (in shares) | shares |  |  | 10,000 |  |  |  |
ACM Insurance Company [Member] |  |  |  |  |  |  |
Treasury Stock, Shares to Establish Reserve Account to Meet Regulatory Requirements for Insurance Company (in shares) | shares |  |  | 14,000 |  |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |
Income Tax Expense (Benefit), Total |  |  | $ 912,000 | $ 672,000 |  |  |
Minimum [Member] |  |  |  |  |  |  |
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period (Year) |  |  | 1 year |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period (Year) |  |  | 5 years |  |  |  |
Accident Protection Plan [Member] |  |  |  |  |  |  |
Contract with Customer, Liability, Total | 40,200,000 |  | $ 40,200,000 |  |  |  |
Service Contract [Member] |  |  |  |  |  |  |
Contract with Customer, Liability, Total | $ 42,169,000 |  | 42,169,000 |  | $ 24,106,000 |  |
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 |  |  | 27.60% |  |  |  |

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