CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($)	Series A Preferred Stock [Member] 5% Percent Convertible Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Subscriptions Receivable [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	(40,688)	(21,439,160)	$ (1,156,311)	4,680,920
Balances (in Shares) at Feb. 29, 2020	571,429	10,310,355
Balances at May. 31, 2020	$ 25,714	$ 939,205	35,213,707	(39,841)	(21,925,732)		14,213,053
Balances (in Shares) at May. 31, 2020	321,429	11,740,089
Exercise of stock options		$ 6,540	89,915				96,455
Exercise of stock options (in Shares)		81,750
Net proceeds from ATM		$ 12,711	998,764				1,011,475
Net proceeds from ATM (in Shares)		158,889
Foreign currency translation				(8,687)			(8,687)
Conversion of preferred to common stock	$ (25,714)	$ 25,714
Conversion of preferred to common stock (in Shares)	(321,429)	321,429
Compensation expense in connection with options granted			261,176				261,176
Net loss					(4,973,889)		(4,973,889)
Balances at Feb. 28, 2021		$ 984,170	$ 36,563,562	$ (48,528)	$ (26,899,621)		$ 10,599,583
Balances (in Shares) at Feb. 28, 2021		12,302,157