3. EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
Earnings Per Share [Abstract]
Numerator: Net loss	$ (2,975)	$ (1,726)	$ (3,729)	$ (4,747)
Denominator for basic net loss per share: Weighted average shares outstanding (in thousands)	13,164	12,677	13,058	11,931
Shares used in basic net loss per share calculation (in thousands)	13,164	12,677	13,058	11,931
Effect of dilutive securities (in thousands)	0	0	0	0
Denominator for diluted net loss per share (in thousands)	13,164	12,677	13,058	11,931
Basic net loss per share	$ (0.23)	$ (0.14)	$ (0.29)	$ (0.40)
Diluted net loss per share	$ (0.23)	$ (0.14)	$ (0.29)	$ (0.40)