Note 4 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Property and equipment, gross	$ 11,664,135	$ 11,773,878
Less Accumulated Depreciation	(9,704,930)	(9,140,320)
Net Property and Equipment	1,959,205	2,633,558
Production Equipment [Member]
Property and equipment, gross	10,114,398	10,370,462
Lab Equipment [Member]
Property and equipment, gross	87,094	76,658
Computer Equipment [Member]
Property and equipment, gross	204,553	185,652
Vehicles [Member]
Property and equipment, gross	$ 75,312	39,090
Furniture and Fixtures [Member]
Useful Life (Year)	5 years
Property and equipment, gross	$ 106,047	146,453
Leasehold Improvements [Member]
Useful Life (Year)	10 years
Property and equipment, gross	$ 1,076,731	$ 955,563
Minimum [Member]
Useful Life (Year)	3 years
Minimum [Member] \| Production Equipment [Member]
Useful Life (Year)	3 years
Minimum [Member] \| Lab Equipment [Member]
Useful Life (Year)	3 years
Minimum [Member] \| Computer Equipment [Member]
Useful Life (Year)	3 years
Minimum [Member] \| Vehicles [Member]
Useful Life (Year)	3 years
Maximum [Member]
Useful Life (Year)	10 years
Maximum [Member] \| Production Equipment [Member]
Useful Life (Year)	10 years
Maximum [Member] \| Lab Equipment [Member]
Useful Life (Year)	10 years
Maximum [Member] \| Computer Equipment [Member]
Useful Life (Year)	5 years
Maximum [Member] \| Vehicles [Member]
Useful Life (Year)	5 years

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

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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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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