Note 6 - Intangible Assets - Summary of Intangible Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Finite-lived intangible assets, gross	$ 486,971	$ 280,451
Finite-lived intangible assets, accumulated amortization	233,347	220,206
Intangible assets, net	$ 253,624	$ 60,335
Patents, Copyrights and Intellectual Property [Member]
Weighted Average Amortization Period (Year)	18 years	16 years
Finite-lived intangible assets, gross	$ 396,757	$ 190,327
Finite-lived intangible assets, accumulated amortization	143,133	129,992
Intangible assets, net	$ 253,624	$ 60,335
Licensing Agreements [Member]
Weighted Average Amortization Period (Year)	5 years	5 years
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]
Weighted Average Amortization Period (Year)	3 years	3 years
Finite-lived intangible assets, gross	$ 58,722	$ 58,722
Finite-lived intangible assets, accumulated amortization	58,722	58,722
Intangible assets, net	$ 0	$ 0
Other Intangible Assets [Member]
Weighted Average Amortization Period (Year)	5 years	5 years
Finite-lived intangible assets, gross	$ 21,492	$ 21,492
Finite-lived intangible assets, accumulated amortization	21,492	21,492
Intangible assets, net	$ 0	$ 0