4. EARNINGS PER SHARE (Details Narrative) - shares	3 Months Ended
	Aug. 31, 2019	Aug. 31, 2018
Employee Stock Purchase Plan
Options not included in the computation of diluted net loss per share (in thousands)	297	359
Convertible Notes
Options not included in the computation of diluted net loss per share (in thousands)	0	2,657
Stock Options
Options not included in the computation of diluted net loss per share (in thousands)	3,434	3,189
Restricted Stock Units
Options not included in the computation of diluted net loss per share (in thousands)	20	43