7. INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018
Income Tax Disclosure [Abstract]
Domestic	$ (2,751)	$ (5,273)	$ 433
Foreign	(15)	65	22
(Loss) income before income tax (expense) benefit	$ (2,766)	$ (5,208)	$ 455