4. EARNINGS PER SHARE (Details Narrative) - shares	6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019
Employee Stock Purchase Plan
Options not included in the computation of diluted net (loss) income per share (in thousands)	72
Stock Options
Options not included in the computation of diluted net (loss) income per share (in thousands)	2,886	2,919
Restricted Stock Units
Options not included in the computation of diluted net (loss) income per share (in thousands)	155