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15. COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
May 31, 2016
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,      
 2017   $488 
 2018    485 
 2019    39 
 2020    —   
 2021    —   
 Thereafter    —   
 Total   $1,012