STOCKBASED COMPENSATION (Tables)

9 Months Ended

Feb. 29, 2024

STOCK-BASED COMPENSATION

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

	Three Months Ended				Nine Months Ended
	February 29,		February 28,		February 29,		February 28,
(In thousands)	2024		2023		2024		2023
Cost of sales	$	58	$	75	$	222	$	252
Research and development		148		158		440		513
Selling, general and administrative		377		359		1,081		1,330
	$	583	$	592	$	1,743	$	2,095

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
Granted		1			22.57
Vested		(32	)		12.42
Forfeited		(6	)		6.21
Unvested, February 29, 2024		353		$	20.16