STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Nov. 30, 2023

STOCK-BASED COMPENSATION

Compensation costs related to the Company's stock-based compensation

	Three Months Ended November 30,				Six Months Ended November 30,
(In thousands)	2023		2022		2023		2022
Cost of sales	$	101	$	85	$	164	$	177
Research and development		139		201		292		355
Selling, general and administrative		398		507		704		971
	$	638	$	793	$	1,160	$	1,503

Nonvested RSU activity

				Weighted
				Average Grant
				Date Fair
	Shares			Value
	(in thousands)			Per Share
Unvested, May 31, 2023		345		$	6.40
Granted		-
Vested		(77	)		7.16
Forfeited		(52	)		5.79
Unvested, August 31, 2023		216		$	6.27
Granted		203			31.51
Vested		(28	)		8.02
Forfeited		(1	)		29.79
Unvested, November 30, 2023		390		$	19.28