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Note 6 - Intangible Assets - Summary of Intangible Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-lived intangible assets, gross	$ 864,566	$ 930,045
Finite-lived intangible assets, accumulated amortization	369,014	267,883
Intangible assets, net	$ 495,552	$ 662,162
Patents, Copyrights and Intellectual Property [Member]
Weighted Average Amortization Period (Year)	14 years	18 years
Finite-lived intangible assets, gross	$ 796,080	$ 839,831
Finite-lived intangible assets, accumulated amortization	300,528	177,669
Intangible assets, net	$ 495,552	$ 662,162
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)	4 years	3 years
Finite-lived intangible assets, gross	$ 58,486	$ 58,722
Finite-lived intangible assets, accumulated amortization	58,486	58,722
Intangible assets, net	$ 0	$ 0
Other Intangible Assets [Member]
Weighted Average Amortization Period (Year)		5 years
Finite-lived intangible assets, gross		$ 21,492
Finite-lived intangible assets, accumulated amortization		21,492
Intangible assets, net		$ 0

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ 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)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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X

- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

Reference 2: 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)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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X

- 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

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