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	$ 2,400		46,930			49,330
Exercise of stock options (in Shares)	30,000
Foreign currency translation				(3,250)		(3,250)
Compensation expense in connection with options granted			500,140			500,140
Net loss					(3,610,492)	(3,610,492)
Balances at Nov. 30, 2020	$ 941,605	$ 25,714	36,935,126	(43,091)	(26,710,573)	11,148,781
Balances (in Shares) at Nov. 30, 2020	11,770,089	321,429
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	$ 1,720		32,760			34,480
Exercise of stock options (in Shares)	21,500
Net proceeds from ATM	$ 29,094		1,655,029			1,684,123
Net proceeds from ATM (in Shares)	363,670
Foreign currency translation				(10,363)		(10,363)
Compensation expense in connection with options granted			634,019			634,019
Net loss					(2,667,855)	(2,667,855)
Balances at Nov. 30, 2021	$ 1,015,385		$ 41,158,551	$ (58,319)	$ (33,214,190)	$ 8,901,427
Balances (in Shares) at Nov. 30, 2021	12,692,327