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11. LONG-TERM DEBT (Tables)
3 Months Ended
Aug. 31, 2016
Long-term Debt, Unclassified [Abstract]  
Long-term debt, net of debt issuance costs

    Long-term debt, net of debt issuance costs (in thousands):

 

   August 31,  May 31,
   2016  2016
Principal  $6,110   $6,110 
Unamortized debt issuance costs   (104)   (148)
   $6,006   $5,962