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11. LONG-TERM DEBT (Details) - USD ($)
$ in Thousands
Aug. 31, 2016
May 31, 2016
Debt Disclosure [Abstract]    
Principal $ 6,110 $ 6,110
Unamortized debt issuance costs (104) (148)
Long-term debt $ 6,006 $ 5,962 [1]
[1] The condensed consolidated balance sheet at May 31, 2016 has been derived from the audited consolidated financial statements at that date.