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Note 6 - Intangible Assets - Summary of Intangible Assets (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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Finite-lived intangible assets, gross | $ 665,976 | $ 887,853
Finite-lived intangible assets, accumulated amortization | 483,138 | 599,196
Intangible assets, net | 182,838 | 288,657
Patents, Copyrights and Intellectual Property [Member] |  |
Finite-lived intangible assets, gross | 601,769 | 792,821
Finite-lived intangible assets, accumulated amortization | 421,583 | 515,665
Intangible assets, net | 180,186 | 277,156
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 | 54,207 | 85,032
Finite-lived intangible assets, accumulated amortization | 51,555 | 73,531
Intangible assets, net | $ 2,652 | $ 11,501

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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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