Note 6 - Property and Equipment - Property, Plant, and Equipment Useful Life (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Property and equipment	$ 3,014,487	$ 2,975,858
Less accumulated depreciation and amortization	(2,838,716)	(2,513,022)
Total	175,771	462,836
Machinery and Equipment [Member]
Property and equipment	2,495,959	2,459,532
Furniture and Fixtures [Member]
Property and equipment	248,709	246,507
Leasehold Improvements [Member]
Property and equipment	$ 269,819	$ 269,819

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02(13))
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-Name Accounting Standards Codification
-Topic 944
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