Note B - Summary of Significant Accounting Policies (Details Textual)		3 Months Ended				6 Months Ended
	Jul. 12, 2024 USD ($)	Oct. 31, 2024 USD ($) $ / shares shares	Jul. 31, 2024 USD ($)	Oct. 31, 2023 USD ($) $ / shares	Jul. 31, 2023 USD ($)	Oct. 31, 2024 USD ($) $ / shares	Oct. 31, 2023 USD ($) $ / shares	Sep. 16, 2024 USD ($)	Sep. 15, 2024 USD ($)	Jun. 03, 2024 USD ($)	Apr. 30, 2024 USD ($)
Long-Term Line of Credit, Net of Debt Issuance Costs		$ 107,365,000				$ 107,365,000					$ 200,819,000
Number of Reportable Segments						1
Revenue from Contract with Customer, Excluding Assessed Tax		285,774,000		$ 300,400,000		$ 573,022,000	$ 610,737,000
Financing Receivables, Allowance for APP Claims		2,651,000				2,651,000					3,171,000
Financing Receivable, Insurance Receivables for APP Claims		$ 2,485,000				2,485,000					3,026,000
Contract with Customer, Liability, Revenue Recognized						$ 22,600,000
Earnings Per Share, Diluted (in dollars per share) | $ / shares		$ 0.61		$ (4.3)		$ 0.55	$ (3.65)
Earnings Per Share, Basic (in dollars per share) | $ / shares		$ 0.62		$ (4.3)		$ 0.57	$ (3.65)
Proceeds from Notes Payable						$ 449,889,000	$ 360,340,000
Average Finance Receivable Interest Rate		17.50%
Financing Receivable Interest Rate		18.25%		18.00%
Interest Receivable		$ 7,573,000				$ 7,573,000					$ 6,907,000
Finance Receivables, Customer Payments Due Either Weekly or Bi-Weekly, Percentage		78.00%
Financing Receivable, Greater Than or Equal to 30 Days Past Due, Percent of Portfolio		3.50%				3.50%					3.10%
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period		69 years
Financing Receivable, Weighted Average Total Contract Term		48 months 6 days
Financing Receivable, Remaining Contract Term		35 months 27 days
Financing Receivables, Allowance for Credit Losses and Other Losses		$ 336,700,000
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent		24.72%	25.00%			24.72%
Finance Receivable, Principal Balance		$ 1,473,794,000		$ 1,463,398,000		$ 1,473,794,000	1,463,398,000				$ 1,435,388,000
Goodwill, Impairment Loss						83,000	$ 94,000
Goodwill		$ 22,900,000				$ 22,900,000					14,400,000
Effective Income Tax Rate Reconciliation, Percent						30.30%	23.40%
Tax Adjustments, Settlements, and Unusual Provisions						$ 0	$ 213,000
Open Tax Year		2021
Income Tax Examination, Penalties and Interest Accrued		$ 0				0					0
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due		6,300,000		7,400,000		6,300,000	7,400,000
Late Fee Income Generated by Servicing Financial Assets, Amount		$ 1,300,000		1,200,000		2,500,000	$ 2,400,000
Treasury Stock Shares to Establish Reserve Account to Secure Service Contracts | shares		10,000
ACM Insurance Company [Member]
Treasury Stock, Shares to Establish Reserve Account to Meet Regulatory Requirements for Insurance Company | shares		14,000
Capitalized Computing Implementation Service Contract [Member]
Capitalized Contract Cost, Net		$ 19,700,000				$ 19,700,000					16,700,000
Capitalized Contract Cost, Amortization		$ 1,100,000		48,000
Texas Auto Center [Member]
Goodwill, Acquired During Period			$ 8,500,000
Goodwill										$ 8,500,000
Maximum [Member]
Financing Receivable Interest Rate		18.25%
ARKANSAS
Financing Receivable Interest Rate		16.75%
ARKANSAS | Maximum [Member]
Financing Receivable Interest Rate		16.75%
ILLINOIS | Minimum [Member]
Financing Receivable Interest Rate		19.50%
ILLINOIS | Maximum [Member]
Financing Receivable Interest Rate		21.50%
TENNESSEE
Financing Receivable Interest Rate		23.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Arkansas, USA [Member]
Concentration Risk, Percentage		28.00%
Service Contract [Member]
Contract with Customer, Liability, Recognition Period (Month)		9 months				9 months
Contract with Customer, Liability, Revenue Recognition, Miles		12,000				12,000
Contract with Customer, Liability, Increase in Timing of Revenue Recognition, Percent		25.00%				25.00%
Contract with Customer, Liability, Revenue Recognized		$ 13,200,000
Contract with Customer, Liability, Revenue Recognized, Net of Tax		7,100,000
Contract with Customer, Liability		55,645,000				$ 55,645,000					68,945,000
Accident Protection Plan [Member]
Contract with Customer, Liability		51,000,000				51,000,000
Accident Protection Plan Claims [Member]
Contract with Customer, Refund Liability		5,300,000				5,300,000
Revision of Prior Period, Adjustment [Member]
Accident Protection Plan Claims		$ 11,700,000				11,700,000
Financing Receivables, Allowance for APP Claims					$ 5,800,000
Financing Receivable, Insurance Receivables for APP Claims					5,900,000
Revision of Prior Period, Adjustment [Member] | Wholesales Third Party [Member]
Revenue from Contract with Customer, Excluding Assessed Tax				$ 1,800,000	$ 1,200,000	3,000,000
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member]
Earnings Per Share, Diluted (in dollars per share) | $ / shares		$ 0.85
Earnings Per Share, Basic (in dollars per share) | $ / shares		$ 0.87
Line of Credit [Member]
Long-Term Line of Credit, Net of Debt Issuance Costs		$ 107,365,000				107,365,000					$ 200,819,000
Revolving Credit Facility [Member] | BMO Harris Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity		320,000,000				$ 320,000,000		$ 320,000,000	$ 340,000,000
Warehouse Facility [Member]
Proceeds from Notes Payable	$ 150,000,000	$ 150,000,000
Notes Payable, Percentage of Note Classified as Non-Recourse		10.00%