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16. COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
May 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Minimum annual rentals payments under non-cancellable operating leases

    Minimum annual rentals payments under non-cancellable operating leases in each of the next five fiscal years and thereafter are as follows (in thousands):

 

Years Ending May 31,      
2019   $ 664  
2020     754  
2021     750  
2022     772  
2023     795  
Thereafter     133  
Total   $ 3,868