CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)	Feb. 28, 2022	May 31, 2021
Allowance for doubtful accounts (in Dollars)	$ 20,293	$ 837,415
Accumulated depreciation and amortization (in Dollars)	2,046,612	1,972,357
Accumulated amortization, Right of Use Assets (in Dollars)	658,773	469,077
Accumulated amortization, Intangible Assets (in Dollars)	$ 49,253	$ 126,769
Preferred Stock, shares issued	0	0
Preferred Stock, shares outstanding	0	0
Preferred Stock, No Par Value (in Dollars per share)	$ 0	$ 0
Preferred Stock, undesignated shares	4,428,571	4,428,571
Common stock par value (in Dollars per share)	$ 0.08	$ 0.08
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	12,851,924	12,307,157
Common stock, shares outstanding	12,851,924	12,307,157
5% Convertible Preferred Stock [Member] | Series A Preferred Stock [Member]
Preferred Stock, Par Value (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