CONSOLIDATED STATEMENTS OF SHAREHOLDERS` EQUITY - USD ($)	Series A Preferred Stock [Member] 5% Convertible Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balances at May. 31, 2020	$ 25,714	$ 939,205	$ 36,388,056	$ (39,841)	$ (23,100,081)	$ 14,213,053
Balances (in Shares) at May. 31, 2020	321,429	11,740,089
Exercise of stock options		$ 6,940	95,315			102,255
Exercise of stock options (in Shares)		86,750
Net proceeds from ATM		$ 12,712	998,763			1,011,475
Net proceeds from ATM (in Shares)		158,889
Foreign currency translation				(8,115)		(8,115)
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			1,354,609			1,354,609
Net loss					(7,446,254)	(7,446,254)
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		$ 3,160	74,200			77,360
Exercise of stock options (in Shares)		39,500
Net proceeds from ATM		$ 41,701	2,275,459			2,317,160
Net proceeds from ATM (in Shares)		521,267
Foreign currency translation				(25,980)		(25,980)
Compensation expense in connection with options granted			1,260,195			1,260,195
Net loss					(4,531,044)	(4,531,044)
Balances at May. 31, 2022		$ 1,029,432	$ 42,446,597	$ (73,936)	$ (35,077,379)	$ 8,324,714
Balances (in Shares) at May. 31, 2022		12,867,924