Note B - Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Apr. 30, 2022 USD ($) shares	Apr. 30, 2021 USD ($) shares	Apr. 30, 2020 USD ($) shares
Number of Reportable Segments	1
Average Finance Receivable Interest Rate	16.50%
Interest Receivable	$ 4,926,000	$ 3,367,000
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	3.00%	2.60%
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period (Year)	75 years
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
Goodwill, Impairment Loss	$ 0	$ 0
Goodwill, Ending Balance	8,623,000	7,280,000
Goodwill, Period Increase (Decrease), Total	1,300,000
Income Tax Examination, Penalties and Interest Accrued, Total	0
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due	3,000,000.0	2,100,000
Late Fee Income Generated by Servicing Financial Assets, Amount	3,100,000	2,500,000	$ 2,300,000
Contract with Customer, Liability, Revenue Recognized	16,500,000	10,300,000
Advertising Expense	$ 5,000,000.0	2,900,000	3,100,000
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Defined Contribution Plan, Employer Contribution Amount	$ 1,200,000	$ 908,000	$ 769,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | shares	215,000
Stock Repurchased During Period, Shares (in shares) | shares	304,204	106,590	182,805
Stock Repurchased During Period, Value	$ 34,700,000	$ 10,600,000	$ 16,000,000.0
Treasury Stock Shares to Establish Reserve Account to Secure Service Contracts (in shares) | shares	10,000
Operating Lease, Weighted Average Remaining Lease Term (Year)	13 years 9 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent	4.33%
ACM Insurance Company [Member]
Treasury Stock, Shares to Establish Reserve Account to Meet Regulatory Requirements for Insurance Company (in shares) | shares	14,000
2006 Employee Stock Purchase Plan [Member]
Common Stock Discount on Shares Percentage	15.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) | shares	200,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | shares	133,621
Minimum [Member]
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period (Year)	1 year
Lessee, Operating Lease, Term of Contract (Year)	3 years
Lessee, Operating Lease, Renewal Term (Year)	3 years
Maximum [Member]
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period (Year)	5 years
Lessee, Operating Lease, Term of Contract (Year)	10 years
Lessee, Operating Lease, Renewal Term (Year)	10 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%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Arkansas, USA [Member]
Concentration Risk, Percentage	27.40%