4. EARNINGS PER SHARE (Details Narrative) - shares	6 Months Ended
	Nov. 30, 2018	Nov. 30, 2017
Employee Stock Purchase Plan
Options not included in the computation of diluted net (loss) income per share (in thousands)	327
Convertible Notes
Options not included in the computation of diluted net (loss) income per share (in thousands)	2,657	2,657
Stock Options
Options not included in the computation of diluted net (loss) income per share (in thousands)	3,373	263
Restricted Stock Units
Options not included in the computation of diluted net (loss) income per share (in thousands)	38