Note 3 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($)	3 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Property and equipment, gross	$ 11,148,044	$ 11,122,732
Less Accumulated Depreciation	(9,663,573)	(9,691,083)
Net Property and Equipment	1,484,471	1,431,649
Production Equipment [Member]
Property and equipment, gross	9,551,758	9,614,189
Lab Equipment [Member]
Property and equipment, gross	81,367	82,930
Computer Equipment [Member]
Property and equipment, gross	298,713	204,807
Vehicles [Member]
Property and equipment, gross	$ 66,031	71,711
Furniture and Fixtures [Member]
Useful Life (Year)	5 years
Property and equipment, gross	$ 109,318	111,417
Leasehold Improvements [Member]
Useful Life (Year)	10 years
Property and equipment, gross	$ 1,040,857	$ 1,037,678
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.

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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.

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