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Note 4 - Income Taxes - Component of Deferred Tax Assets (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Stock option expense | $ 689,600 | $ 275,000
NOL carryforward | 7,080,600 | 5,214,200
Research and development credits | 1,656,500 | 1,656,500
Unrealized gain from investment in Alphazyme | (69,800) | 0
Other | 7,900 | 4,400
Deferred tax asset, net of deferred tax liabilities | 9,364,800 | 7,150,100
Valuation allowance | (9,364,800) | (7,150,100)
Net deferred tax asset | $ 0 | $ 0

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