8. LONG-TERM DEBT (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2017	Apr. 10, 2015
Long-term Debt, Unclassified [Abstract]
Convertible debt, principal amount		$ 6,110	$ 6,110	$ 4,110
Convertible note, maturity	Apr. 10, 2019
Line of credit, maximum borrowing capacity		2,000	2,000	$ 2,000
Balance available to borrow under the line of credit	$ 0	0
Convertible note, interest rate	9.00%
Convertible note, interest payment	Interest is payable quarterly on March 1, June 1, September 1 and December 1 of each year.
Debt issuance costs	$ 356
Conversion price for the Convertible Notes	$ 2.30			$ 2.65
Convertible Notes, Terms of Conversion Feature	The conversion price for the Convertible Notes was $2.30 per share and was subject to adjustment upon the occurrence of certain specified events. Holders could convert all or any part of the principal amount of their Convertible Notes in integrals of $10,000 at any time prior to the maturity date. Upon conversion, the Company would deliver shares of its common stock to the holder of Convertible Notes electing such conversion. The Company could not redeem the Convertible Notes prior to maturity.
Repayment of Convertible Notes	$ (6,110)	$ 0	$ 0