Note 5 - Property and Equipment - Major Classes of Property and Equipment (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Property and equipment, gross	$ 991,453	$ 992,571
Less accumulated depreciation	(950,417)	(902,260)
Property and equipment, net	41,036	90,311
Furniture and Fixtures [Member]
Property and equipment, gross	35,407	35,407
Office Equipment [Member]
Property and equipment, gross	138,897	138,897
Equipment [Member]
Property and equipment, gross	$ 817,149	$ 818,267

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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