Note C - Finance Receivables, Net (Details Textual)	6 Months Ended
	Oct. 31, 2022 USD ($)	Oct. 31, 2021 USD ($)
Finance Receivables, Number of Loan Classes	1
Finance Receivables, Number of Risk Pools	1
Financing Receivable, Allowance for Credit Loss, Recovery	$ 1,200,000	$ 1,100,000
Net Charge Offs as Percentage of Average Finance Receivables	11.00%	8.40%
Collections as Percentage of Average Financing Receivables	17.40%	21.90%
Delinquencies Greater Than 30 Days as Percentage of Average Financing Receivables	3.60%	4.00%
Increase (Decrease) in Average Selling Price	$ 2,478
Increase (Decrease) in Average Selling Price, Percentage	15.90%
Maximum [Member]
Financing Receivable Interest Rate	16.50%
Financing Receivable Payment Period (Month)	54 months
Maximum [Member] | ILLINOIS
Financing Receivable Interest Rate	21.50%
Minimum [Member]
Financing Receivable Payment Period (Month)	18 months
Minimum [Member] | ILLINOIS
Financing Receivable Interest Rate	19.50%