Note I - Stock-based Compensation (Tables)

3 Months Ended

Jul. 31, 2023

Notes Tables

Stock Option Plan Comparison [Table Text Block]

	Restated Option Plan
Minimum exercise price as a percentage of fair market value at date of grant	100%
Last expiration date for outstanding options	May 1, 2033
Shares available for grant at July 31, 2023	225,000

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Three Months Ended July 31,
	2023			2022
Expected terms (years)		5.5			5.5
Risk-free interest rate		3.66	%		2.92	%
Volatility		58	%		51	%
Dividend yield		-			-

Schedule of Share-based Compensation, Stock Options, Exercises [Table Text Block]

	Three Months Ended July 31,
(Dollars in thousands)	2023		2022
Options exercised		30,000		23,000
Cash received from option exercises	$	-	$	1,216
Intrinsic value of options exercised	$	1,036	$	1,204