Note 5 - Property and Equipment - Schedule of Property and Equipment (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Property and equipment, gross	$ 679,370	$ 659,441
Accumulated depreciation and amortization	(529,571)	(511,700)
Property and equipment, net	149,799	147,741
Laboratory Equipment [Member]
Property and equipment, gross	543,912	532,100
Leasehold Improvements [Member]
Property and equipment, gross	115,605	115,605
Other Furniture Fixtures And Equipment [Member]
Property and equipment, gross	$ 19,853	$ 11,736

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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