2. EARNINGS PER SHARE (EPS) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2018	May 31, 2017	May 31, 2016
Earnings Per Share [Abstract]
Numerator: Net income (loss)	$ 191	$ 267	$ 60	$ 10	$ (795)	$ (2,651)	$ (1,452)	$ (755)	$ 528	$ (5,653)	$ (6,785)
Denominator for basic net income (loss) per share: Weighted average shares outstanding									21,732,000	16,267,000	13,091,000
Shares used in basic net income (loss) per share calculation									21,732,000	16,267,000	13,091,000
Effect of dilutive securities									1,050,000	0	0
Denominator for diluted net income (loss) per share									22,782,000	16,267,000	13,091,000
Basic net income (loss) per share									$ .02	$ (0.35)	$ (0.52)
Diluted net income (loss) per share									$ .02	$ (0.35)	$ (0.52)