Note B - Summary of Significant Accounting Policies (Details Textual)	3 Months Ended	6 Months Ended		18 Months Ended
	Jul. 31, 2022 USD ($)	Oct. 31, 2022 USD ($) shares	Oct. 31, 2021 USD ($)	Oct. 31, 2021 USD ($)	Apr. 30, 2022 USD ($)	Jul. 31, 2021 USD ($)	Apr. 30, 2021 USD ($)
Number of Reportable Segments		1
Average Finance Receivable Interest Rate		16.50%
Interest Receivable		$ 5,382,000			$ 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 (Year)		44 years 9 months 18 days
Financing Receivable, Remaining Contract Term (Year)		35 years 6 months
Financing Receivable, Allowance for Credit Loss, Ending Balance		$ 272,730,000	$ 208,957,000	$ 208,957,000	$ 237,823,000		$ 177,267,000
Finance Receivables, Allowance, Percent of Principle Balance		23.65%
Finance Receivable, Principal Balance	$ 1,259,649,000	$ 1,259,649,000	$ 966,425,000	966,425,000	1,101,497,000	$ 966,425,000
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		$ 8,848,000			8,623,000
Effective Income Tax Rate Reconciliation, Percent, Total		22.70%	21.90%
Tax Adjustments, Settlements, and Unusual Provisions		$ 206,000	$ 910,000
Income Tax Examination, Penalties and Interest Accrued, Total		0			0
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due		3,500,000	6,500,000	$ 6,500,000
Late Fee Income Generated by Servicing Financial Assets, Amount		2,000,000.0	$ 1,400,000
Contract with Customer, Liability, Revenue Recognized		$ 17,100,000
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		$ 49,200,000
Service Contract [Member]
Contract with Customer, Liability, Total		57,265,000			$ 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		28.00%