EARNINGS PER SHARE (EPS) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	May 31, 2022	Feb. 28, 2022	Nov. 30, 2021	Aug. 31, 2021	May 31, 2021	Feb. 28, 2021	Nov. 30, 2020	Aug. 31, 2020	May 31, 2022	May 31, 2021	May 31, 2020
EARNINGS PER SHARE (EPS)
Numerator: Net income (loss)	$ 5,794	$ 2,243	$ 717	$ 696	$ 567	$ (735)	$ (1,966)	$ 107	$ 9,450	$ (2,027)	$ (2,802)
Weighted average shares outstanding									26,014,000	23,457,000	22,882,000
Shares used in basic net income (loss) per share calculation									26,014,000	23,457,000	22,882,000
Effect of dilutive securities									1,760,000	0	0
Denominator for diluted net income (loss) per share									27,774,000	23,457,000	22,882,000
Basic net income (loss) per share	$ 0.21	$ 0.08	$ 0.03	$ 0.03	$ 0.02	$ (0.03)	$ (0.08)	$ 0.00	$ 0.36	$ (0.09)	$ (0.12)
Diluted net income (loss) per share	$ 0.20	$ 0.08	$ 0.03	$ 0.03					$ 0.34	$ (0.09)	$ (0.12)