EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2022	Nov. 30, 2021	Nov. 30, 2022	Nov. 30, 2021
EARNINGS PER SHARE
Net income	$ 3,725	$ 717	$ 4,314	$ 1,413
Denominator for basic net income per share: weighted average shares outstanding	27,579	26,205	27,410	25,102
Shares used in basic net income per share calculation	27,579	26,205	27,410	25,102
Effect of dilutive securities	1,501	2,137	1,524	1,747
Denominator for diluted net income per share	29,080	28,342	28,934	26,849
Basic net income per share	$ 0.14	$ 0.03	$ 0.16	$ 0.06
Diluted net income per share	$ 0.13	$ 0.03	$ 0.15	$ 0.05