Note 5 - Property and Equipment - Schedule of Property and Equipment (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Property and equipment, gross	$ 707,159	$ 659,441	$ 661,918
Accumulated depreciation and amortization	(538,506)	(511,700)	(651,312)
Property and equipment, net	168,653	147,741	10,606
Equipment and Furnishings [Member]
Property and equipment, gross	591,554	543,836
Leasehold Improvements [Member]
Property and equipment, gross	$ 115,605	$ 115,605	$ 115,605

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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