Note 6 - Intangible Assets - Summary of Intangible Assets (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
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