CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS` EQUITY (Unaudited) - 6 months ended Nov. 30, 2019 - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Subscriptions Receivable [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balances, at May. 31, 2019	$ 774,173	$ 22,830,006		$ (36,531)	$ (19,586,678)	$ 3,980,970
Balances, (in Shares) at May. 31, 2019	9,677,188
Exercise of stock options	$ 4,330	44,598				48,928
Exercise of stock options (in Shares)	54,125
Net proceeds from ATM	$ 9,582	313,687	(15,583)			307,686
Net proceeds from ATM (in Shares)	119,777
Foreign currency translation				(5,085)		(5,085)
Compensation expense in connection with options granted		34,978				34,978
Net loss					(991,556)	(991,556)
Balances, at Nov. 30, 2019	$ 788,085	$ 23,223,269	$ (15,583)	$ (41,616)	$ (20,578,234)	$ 3,375,921
Balances, (in Shares) at Nov. 30, 2019	9,851,090