CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS` EQUITY (Unaudited) - 9 months ended Feb. 29, 2020 - USD ($)	Series A Preferred Stock [Member] 5% Convertible Preferred Stock [Member]	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		$ 6,430	73,398				79,828
Exercise of stock options (in Shares)		80,375
Net proceeds from ATM		$ 44,224	1,478,345	(1,156,311)			366,258
Net proceeds from ATM (in Shares)		552,792
Issuance of preferred stock	$ 45,714		1,871,872				1,917,586
Issuance of preferred stock (in Shares)	571,429
Foreign currency translation					(4,157)		(4,157)
Compensation expense in connection with options granted			192,917				192,917
Net loss						(1,852,482)	(1,852,482)
Balances at Feb. 29, 2020	$ 45,714	$ 824,827	$ 26,446,538	$ (1,156,311)	$ (40,688)	$ (21,439,160)	$ 4,680,920
Balances (in Shares) at Feb. 29, 2020	571,429	10,310,355