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16. COMMITMENTS AND CONTINGENCIES (Tables)
12 Months Ended
May 31, 2017
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,      
2018   $ 502  
2019     64  
2020     1  
2021      --  
2022     --  
Thereafter      --  

Total 

  $ 567