Note I - Stock-based Compensation Plans (Tables)

6 Months Ended

Oct. 31, 2022

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, 2032
Shares available for grant at October 31, 2022		77,500

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

	Six Months Ended October 31,
	2022			2021
Expected terms (years)		5.5			5.5
Risk-free interest rate		3.59	%		0.86	%
Volatility		55	%		51	%
Dividend yield		-			-

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

	Six Months Ended October 31,
(Dollars in thousands)	2022		2021
Options exercised		23,000		56,500
Cash received from option exercises	$	1,216	$	251
Intrinsic value of options exercised	$	1,204	$	4,896