EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
Earnings per share
Numerator: Net income	$ 4,132	$ 2,243	$ 8,446	$ 3,656
Denominator for basic per share: weighted average shares outstanding	27,893	26,871	27,571	25,684
Shares used in basic earnings per share calculation	27,893	26,871	27,571	25,684
Effect of dilutive securities	1,480	1,983	1,509	1,826
Denominator for diluted earnings per share	29,373	28,854	29,080	27,510
Basic earnings per share	$ 0.15	$ 0.08	$ 0.31	$ 0.14
Diluted earnings per share	$ 0.14	$ 0.08	$ 0.29	$ 0.13