3. EARNINGS PER SHARE (Details Narrative) - shares	6 Months Ended
	Nov. 30, 2017	Nov. 30, 2016
Employee Stock Purchase Plan
Options not included in the computation of diluted net income (loss) per share (in thousands)		246
Convertible Notes
Options not included in the computation of diluted net income (loss) per share (in thousands)	2,657	2,657
Stock Options
Options not included in the computation of diluted net income (loss) per share (in thousands)	263	3,229
Restricted Stock Units
Options not included in the computation of diluted net income (loss) per share (in thousands)		72