11. LONG-TERM DEBT AND LINE OF CREDIT (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Nov. 30, 2015	Nov. 30, 2015	Nov. 30, 2014	May. 31, 2015
Long-term Debt And Line Of Credit Details Narrative
Convertible debt, principal amount	$ 4,110	$ 4,110		$ 4,110
Convertible note, interest rate		9.00%
Convertible note, maturity		Apr. 10, 2017
Convertible note, interest payment		Interest is payable quarterly on March 1, June 1, September 1 and December 1 of each year.
Debt issuance costs		$ 356
Debt issuance costs, effective interest rate	4.30%	4.30%
Amortization of debt issuance costs	$ 44	$ 82	$ 0
Unamortized debt issuance costs	$ (237)	$ (237)		(319)
Initial conversion price for the Convertible Notes	$ 2.65	$ 2.65
Convertible Notes, Terms of Conversion Feature		The initial conversion price for the Convertible Notes is $2.65 per share of the Company's common stock and is subject to adjustment upon the occurrence of certain specified events (as adjusted, the "Conversion Price"). Holders may convert all or any part of the principal amount of their Convertible Notes in integrals of $10,000 at any time prior to the maturity date. Upon conversion, the Company will deliver shares of its common stock to the holder of Convertible Notes electing such conversion. The Company may not redeem the Convertible Notes prior to maturity.
Line of credit, maximum borrowing capacity	$ 2,000	$ 2,000
Line of credit facility, amount borrowed	$ 0	$ 0		$ 0
Weighted average interest rate	5.00%	5.00%
Line of Credit Facility, Frequency of Payments		Each advance under the Credit Facility and any accrued and unpaid interest thereon must be repaid within 90 days from the date on which such advance is made.
Balance available to borrow under the line of credit	$ 2,000	$ 2,000