4. EARNINGS PER SHARE (Details Narrative) - shares	9 Months Ended
	Feb. 28, 2019	Feb. 28, 2018
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)	3,220	983
Restricted Stock Units
Options not included in the computation of diluted net (loss) income per share (in thousands)	34