Note 3 - Property, Plant, and Equipment - Summary of Property, Plant, and Equipment (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Property, plant, and equipment, gross	$ 14,420,559	$ 19,055,260
Less accumulated depreciation	9,722,009	13,378,021
Property, plant, and equipment, net	4,698,550	5,677,239
Land and Land Improvements [Member]
Property, plant, and equipment, gross	905,190	905,190
Building [Member]
Property, plant, and equipment, gross	9,964,523	9,950,190
Machinery and Equipment [Member]
Property, plant, and equipment, gross	180,519	4,755,727
Office Equipment [Member]
Property, plant, and equipment, gross	1,157,392	1,183,115
Computer Equipment and Software [Member]
Property, plant, and equipment, gross	$ 2,212,935	$ 2,261,038

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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