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9. LONG-TERM DEBT (Tables)
 12 Months Ended
May 31, 2017
Long-term Debt, Unclassified [Abstract]  
Long-term debt, net of debt issuance costs

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

 

   May 31,  May 31,
   2017  2016
Principal  $6,110   $6,110 
Unamortized debt issuance costs   —    (148)
                                        $6,110   $5,962