3. EARNINGS PER SHARE (EPS) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2019	May 31, 2018	May 31, 2017
Earnings Per Share [Abstract]
Numerator: Net (loss) income	$ 110	$ (3,201)	$ (629)	$ (1,515)	$ 191	$ 267	$ 60	$ 10	$ (5,235)	$ 528	$ (5,653)
Denominator for basic net (loss) income per share: Weighted average shares outstanding (in thousands)									22,387	21,732	16,267
Shares used in basic net (loss) income per share calculation (in thousands)									22,387	21,732	16,267
Effect of dilutive securities (in thousands)									0	1,050	0
Denominator for diluted net (loss) income per share (in thousands)									22,387	22,782	16,267
Basic net (loss) income per share									$ (.23)	$ 0.02	$ (0.35)
Diluted net (loss) income per share									$ (0.23)	$ 0.02	$ (0.35)