CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)	May 31, 2022	May 31, 2021
Allowance for doubtful accounts (in Dollars) (in Dollars)	$ 153,231	$ 837,415
Accumulated depreciation and amortization (in Dollars) (in Dollars)	1,305,360	1,972,357
Accumulated amortization, Right of Use Assets (in Dollars) (in Dollars)	724,802	469,077
Accumulated amortization, Intangible Assets (in Dollars) (in Dollars)	$ 18,994	$ 126,769
Preferred Stock, shares issued	0	0
Preferred Stock, shares outstanding	0	0
Preferred Stock, No Par Value (in Dollars per share) (in Dollars per share)	$ 0	$ 0
Preferred Stock, undesignated shares	4,428,571	4,428,571
Common stock par value (in Dollars per share) (in Dollars per share)	$ 0.08	$ 0.08
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	12,867,924	12,307,157
Common stock, shares outstanding	12,867,924	12,307,157
5% Convertible Preferred Stock [Member] | Series A Preferred Stock [Member]
Preferred Stock, Par Value (in Dollars per share) (in Dollars per share)	$ 0.08	$ 0.08
Preferred Stock, shares authorized	571,429	571,429
Preferred Stock, shares issued	0	0
Preferred Stock, shares outstanding	0	0