3. EARNINGS PER SHARE (''EPS'') (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	May 31, 2020	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	May 31, 2020	May 31, 2019	May 31, 2018
Earnings Per Share [Abstract]
Numerator: Net (loss) income	$ (2,885)	$ 245	$ 251	$ (413)	$ 110	$ (3,201)	$ (629)	$ (1,515)	$ (2,802)	$ (5,235)	$ 528
Denominator for basic net (loss) income per share: Weighted average shares outstanding (in thousands)									22,882	22,387	21,732
Shares used in basic net (loss) income per share calculation (in thousands)									22,882	22,387	21,732
Effect of dilutive securities (in thousands)									0	0	1,050
Denominator for diluted net (loss) income per share (in thousands)									22,882	22,387	22,782
Basic net (loss) income per share									$ (.12)	$ (0.23)	$ 0.02
Diluted net (loss) income per share									$ (0.12)	$ (0.23)	$ 0.02