3. EARNINGS PER SHARE (Details Narrative) - shares	9 Months Ended
	Feb. 28, 2018	Feb. 28, 2017
Employee Stock Purchase Plan
Options not included in the computation of diluted net income (loss) per share (in thousands)		253
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)	983	3,157
Restricted Stock Units
Options not included in the computation of diluted net income (loss) per share (in thousands)		34