14. RESTRUCTURING (Details Narrative) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Restructuring Charges [Abstract]
Expected restructuring charges			$ 700
Restructuring charges	$ 607	$ 0	607	$ 0
Restructuring charges expected to be recognized in the next quarter			$ 100

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration