EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Aug. 31, 2021	Aug. 31, 2020
Net income	$ 696	$ 107
Denominator for basic net income per share: Weighted average shares outstanding (in thousands)	23,999	23,248
Denominator for diluted net income per share (in thousands)	25,356	23,455
Numerator [Member]
Net income	$ 696	$ 107
Denominator [Member]
Denominator for basic net income per share: Weighted average shares outstanding (in thousands)	23,999	23,248
Shares used in basic net income per share calculation (in thousands)	23,999	23,248
Effect of dilutive securities (in thousands)	1,357	207
Denominator for diluted net income per share (in thousands)	25,356	23,455
Basic net income per share	$ 0.03	$ 0.00
Diluted net income per share	$ 0.03	$ 0.00