CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - 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		$ 1,000	13,900			14,900
Exercise of stock options (in Shares)		12,500
Foreign currency translation				(1,721)		(1,721)
Compensation expense in connection with options granted			246,787			246,787
Net loss					(1,892,394)	(1,892,394)
Balances at Aug. 31, 2020	$ 25,714	$ 940,205	36,648,743	(41,562)	(24,992,475)	12,580,625
Balances (in Shares) at Aug. 31, 2020	321,429	11,752,589
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		$ 120	3,775			3,895
Exercise of stock options (in Shares)		1,500
Net proceeds from ATM		$ 16,124	784,586			800,710
Net proceeds from ATM (in Shares)		201,553
Foreign currency translation				(5,613)		(5,613)
Compensation expense in connection with options granted			319,622			319,622
Net loss					(1,542,581)	(1,542,581)
Balances at Aug. 31, 2021		$ 1,000,815	$ 39,944,726	$ (53,569)	$ (32,088,916)	$ 8,803,056
Balances (in Shares) at Aug. 31, 2021		12,510,210