NET INCOME (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2024	Feb. 28, 2023	Feb. 29, 2024	Feb. 28, 2024	Feb. 28, 2023
Net income (loss) per share:
Net income	$ (1,471)	$ 4,132	$ 9,292	$ 9,292	$ 8,446
Denominator: Weighted average shares outstanding	28,866,000	27,893,000	28,773,000		27,571,000
Dilutive effect of common equivalent shares outstanding	0	1,480,000	897,000		1,509,000
Denominator: Diluted weighted average shares outstanding	28,866,000	29,373,000	29,670,000		29,080,000
Basic net income (loss) per share	$ (0.05)	$ 0.15	$ 0.32		$ 0.31
Diluted net income (loss) per share	$ (0.05)	$ 0.14	$ 0.31		$ 0.29
Antidilutive employee share-based award shares, excluded	1,203,000	15,000	71,000		15,000