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CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) | Nov. 30, 2021 | May 31, 2021
--- | --- | ---
Allowance for doubtful accounts (in Dollars) | $ 27,777 | $ 837,415
Accumulated depreciation and amortization (in Dollars) | 2,026,764 | 1,972,357
Accumulated amortization, Right of Use Assets (in Dollars) | 595,116 | 469,077
Accumulated amortization, Intangible Assets (in Dollars) | $ 91,030 | $ 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 | 12,692,327 | 12,307,157
Common stock, shares outstanding | 12,692,327 | 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

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