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9. LONG-TERM DEBT (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
May 31, 2017
May 31, 2016
May 31, 2015
Jul. 17, 2016
Apr. 14, 2016
Apr. 10, 2015
Debt Disclosure [Abstract]            
Convertible debt, principal amount $ 6,110 $ 6,110        
Convertible note, interest rate 9.00%          
Convertible note, maturity Apr. 10, 2019          
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          
Amortization of debt issuance costs 148 177 $ 31      
Unamortized debt issuance costs $ 0 $ (148)        
Initial conversion price for the Convertible Notes $ 2.30          
Convertible Notes, Terms of Conversion Feature

The conversion price for the Convertible Notes is $2.30 per share and is subject to adjustment upon the occurrence of certain specified events. Holders may 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 will deliver shares of its common stock to the holder of Convertible Notes electing such conversion. The Company may not redeem the Convertible Notes prior to maturity.

         
Line of credit, maximum borrowing capacity $ 2,000         $ 2,000
Balance available to borrow under the line of credit $ 0          
Convertible Debt Principal amount           $ 4,110
Conversion from the Credit Facility to Convertible Note       $ 1,100 $ 900