Note B - Summary of Significant Accounting Policies (Details Textual)	1 Months Ended	9 Months Ended
	Dec. 31, 2022 USD ($)	Jan. 31, 2023 USD ($) shares	Jan. 31, 2022 USD ($)	Apr. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Apr. 30, 2021 USD ($)
Number of Reportable Segments		1
Average Finance Receivable Interest Rate		16.50%
Financing Receivable Interest Rate	18.00%	18.00%
Interest Receivable	$ 6,249,000	$ 6,200,000		$ 4,900,000	$ 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		3.70%		3.00%
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period (Month)		45 months 12 days
Financing Receivable, Remaining Contract Term (Month)		35 months 15 days
Financing Receivable, Allowance for Credit Loss, Ending Balance		$ 282,775,000	$ 222,214,000	$ 237,823,000		$ 177,267,000
Finance Receivables, Allowance, Percent of Principle Balance		23.65%
Finance Receivable, Principal Balance		$ 1,305,956,000	1,029,203,000	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	11,666,000	$ 11,700,000		8,600,000	8,623,000
Effective Income Tax Rate Reconciliation, Percent, Total		22.10%	22.60%
Tax Adjustments, Settlements, and Unusual Provisions		$ 206,000	$ 912,000
Income Tax Examination, Penalties and Interest Accrued, Total		0		$ 0
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due		4,000,000.0	5,200,000
Late Fee Income Generated by Servicing Financial Assets, Amount		3,100,000	$ 2,200,000
Contract with Customer, Liability, Revenue Recognized		$ 22,800,000
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
Accident Protection Plan [Member]
Contract with Customer, Liability, Total		$ 49,900,000
Service Contract [Member]
Contract with Customer, Liability, Total	$ 60,428,000	$ 60,400,000			$ 48,555,000
Minimum [Member]
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period (Month)		1 year
Maximum [Member]
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period (Month)		5 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%
ARKANSAS
Financing Receivable Interest Rate	16.50%	16.50%
ILLINOIS | Minimum [Member]
Financing Receivable Interest Rate	19.50%	19.50%
ILLINOIS | Maximum [Member]
Financing Receivable Interest Rate	21.50%	21.50%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Arkansas, USA [Member]
Concentration Risk, Percentage		28.00%