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Note 6 - Intangible Assets - Summary of Intangible Assets (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Finite-lived intangible assets, gross | $ 887,853 | $ 929,816
Finite-lived intangible assets, accumulated amortization | 599,196 | 488,639
Intangible assets, net | 288,657 | 441,177
Patents, Copyrights and Intellectual Property [Member] |  |
Finite-lived intangible assets, gross | 792,821 | 836,544
Finite-lived intangible assets, accumulated amortization | 515,665 | 413,957
Intangible assets, net | 277,156 | 422,587
Licensing Agreements [Member] |  |
Finite-lived intangible assets, gross | 10,000 | 10,000
Finite-lived intangible assets, accumulated amortization | 10,000 | 10,000
Intangible assets, net | 0 | 0
Certifications [Member] |  |
Finite-lived intangible assets, gross | 85,032 | 83,272
Finite-lived intangible assets, accumulated amortization | 73,531 | 64,682
Intangible assets, net | $ 11,501 | $ 18,590

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