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Note 6 - Intangible Assets - Summary of Intangible Assets (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Finite-lived intangible assets, gross | $ 930,045 | $ 486,971
Finite-lived intangible assets, accumulated amortization | 267,883 | 233,347
Intangible assets, net | $ 662,162 | $ 253,624
Patents, Copyrights and Intellectual Property [Member] |  |
Weighted Average Amortization Period (Year) | 18 years | 18 years
Finite-lived intangible assets, gross | $ 839,831 | $ 396,757
Finite-lived intangible assets, accumulated amortization | 177,669 | 143,133
Intangible assets, net | $ 662,162 | $ 253,624
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

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- 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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Balance Type: | na
Period Type: | duration

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- 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/presentationRef -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 + Details
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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Details
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- Details
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- Details
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- Details
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