4. EARNINGS PER SHARE (Details Narrative) - shares	9 Months Ended
	Feb. 28, 2021	Feb. 29, 2020
Employee Stock Purchase Plan
Options not included in the computation of diluted net (loss) income per share (in thousands)	139	0
Stock Options
Options not included in the computation of diluted net (loss) income per share (in thousands)	2,804	2,505
Restricted Stock Units
Options not included in the computation of diluted net (loss) income per share (in thousands)	143	0