11. LONG-TERM DEBT (Details) - USD ($) $ in Thousands	Feb. 28, 2017	May 31, 2016
Debt Disclosure [Abstract]
Principal	$ 6,110	$ 6,110
Unamortized debt issuance costs	(15)	(148)
Long-term debt	$ 6,095	$ 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.