Note 4 - Property, Plant, and Equipment - Summary of Property, Plant, and Equipment (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Property, plant, and equipment	$ 14,527,400	$ 14,420,559
Less accumulated depreciation	10,086,560	9,722,009
Property, plant, and equipment, net	4,440,840	4,698,550
Land and Land Improvements [Member]
Property, plant, and equipment	905,190	905,190
Building [Member]
Property, plant, and equipment	10,145,005	9,964,523
Office Equipment and Machinery [Member]
Property, plant, and equipment	1,237,142	1,337,911
Computer Equipment and Software [Member]
Property, plant, and equipment	$ 2,240,063	$ 2,212,935

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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