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Note 6 - Intangible Assets - Summary of Intangible Assets (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
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Finite-lived intangible assets, gross | $ 929,816 | $ 864,566
Finite-lived intangible assets, accumulated amortization | 488,639 | 369,014
Intangible assets, net | 441,177 | 495,552
Patents, Copyrights and Intellectual Property [Member] |  |
Finite-lived intangible assets, gross | 836,544 | 796,080
Finite-lived intangible assets, accumulated amortization | 413,957 | 300,528
Intangible assets, net | 422,587 | 495,552
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 | 83,272 | 58,486
Finite-lived intangible assets, accumulated amortization | 64,682 | 58,486
Intangible assets, net | $ 18,590 | $ 0

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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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