CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS` EQUITY (Unaudited) - USD ($)	Common Stock [Member]	5% Convertible Preferred Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balances at May. 31, 2020	$ 939,205	$ 25,714	$ 36,388,056	$ (39,841)	$ (23,100,081)	$ 14,213,053
Balances (in Shares) at May. 31, 2020	11,740,089	321,429
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			1,022,320			1,022,320
Net loss					(5,735,033)	(5,735,033)
Balances at Feb. 28, 2021	$ 984,170		38,499,055	(48,528)	(28,835,114)	10,599,583
Balances (in Shares) at Feb. 28, 2021	12,302,157
Balances at May. 31, 2021	$ 984,571		38,836,743	(47,956)	(30,546,335)	9,227,023
Balances (in Shares) at May. 31, 2021	12,307,157
Exercise of stock options	$ 1,880		37,295			$ 39,175
Exercise of stock options (in Shares)	23,500					23,500
Net proceeds from ATM	$ 41,701		2,275,459			$ 2,317,160
Net proceeds from ATM (in Shares)	521,267
Foreign currency translation				(12,901)		(12,901)
Compensation expense in connection with options granted			959,368			959,368
Net loss					(2,772,023)	(2,772,023)
Balances at Feb. 28, 2022	$ 1,028,152		$ 42,108,865	$ (60,857)	$ (33,318,358)	$ 9,757,802
Balances (in Shares) at Feb. 28, 2022	12,851,924