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CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) | May 31, 2021 | May 31, 2020
--- | --- | ---
Allowance for doubtful accounts (in Dollars) | $ 837,415 | $ 70,981
Accumulated depreciation and amortization (in Dollars) | 1,972,357 | 1,867,643
Accumulated amortization, Right of Use Assets (in Dollars) | 469,077 | 231,489
Accumulated amortization, Intangible Assets (in Dollars) | $ 126,769 | $ 496,124
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 | 12,307,157 | 11,740,089
Common stock, shares outstanding | 12,307,157 | 11,740,089
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 | 321,429
Preferred Stock, shares outstanding | 0 | 321,429
Preferred Stock [Member] |  |
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

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