2. EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Aug. 31, 2018	Aug. 31, 2017
Earnings Per Share [Abstract]
Numerator: Net (loss) income	$ (1,515)	$ 10
Denominator for basic net (loss) income per share: Weighted average shares outstanding (in thousands)	22,190	21,417
Shares used in basic net (loss) income per share calculation (in thousands)	22,190	21,417
Effect of dilutive securities (in thousands)	0	1,574
Denominator for diluted net (loss) income per share (in thousands)	22,190	22,991
Basic net (loss) income per share	$ (0.07)	$ .00
Diluted net (loss) income per share	$ (0.07)	$ .00