Note B - Summary of Significant Accounting Policies (Details Textual)	3 Months Ended		15 Months Ended
	Jul. 31, 2022 USD ($) shares	Jul. 31, 2021 USD ($)	Jul. 31, 2021 USD ($)	Apr. 30, 2022 USD ($)	Apr. 30, 2021 USD ($)
Number of Reportable Segments	1
Average Finance Receivable Interest Rate	16.50%
Interest Receivable	$ 5,032,000			$ 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%
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period (Day)	68 days
Financing Receivable, Weighted Average Total Contract Term (Month)	44 months
Financing Receivable, Remaining Contract Term (Month)	35 months
Financing Receivable, Allowance for Credit Loss, Ending Balance	$ 265,818,000	$ 201,874,000	$ 201,874,000	$ 247,207,000	$ 184,418,000
Finance Receivables, Allowance, Percent of Principle Balance	24.50%
Finance Receivable, Principal Balance	$ 1,185,276,000	$ 890,467,000	890,467,000	1,101,497,000
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 1 month 6 days
Goodwill, Impairment Loss	$ 0		0
Goodwill, Ending Balance	$ 8,623,000			8,623,000
Effective Income Tax Rate Reconciliation, Percent, Total	22.70%	21.40%
Tax Adjustments, Settlements, and Unusual Provisions	$ 206,000	$ 644,000
Income Tax Examination, Penalties and Interest Accrued, Total	0			0
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due	2,700,000	4,000,000.0	$ 4,000,000.0
Late Fee Income Generated by Servicing Financial Assets, Amount	970,000	$ 640,000
Contract with Customer, Liability, Revenue Recognized	$ 9,600,000
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
Minimum [Member]
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period (Day)	1 year
Maximum [Member]
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period (Day)	5 years
Accident Protection Plan [Member]
Contract with Customer, Liability, Total	$ 46,900,000
Service Contract [Member]
Contract with Customer, Liability, Total	53,459,000			$ 48,555,000
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	28.30%