Note 6 - Intangible Assets - Summary of Intangible Assets (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
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