3. EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2015
Earnings Per Share [Abstract]
Numerator: Net loss	$ (1,452)	$ (1,048)	$ (2,207)	$ (754)
Denominator for basic net loss per share: Weighted average shares outstanding (in thousands)	16,029	13,048	14,673	13,005
Shares used in basic net loss per share calculation (in thousands)	16,029	13,048	14,673	13,005
Effect of dilutive securities (in thousands)	0	0	0	0
Denominator for diluted net loss per share (in thousands)	16,029	13,048	14,673	13,005
Basic net loss per share	$ (.09)	$ (.08)	$ (.15)	$ (.06)
Diluted net loss per share	$ (0.09)	$ (0.08)	$ (0.15)	$ (0.06)