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Note 4 - Income Taxes - Component of Deferred Tax Assets (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Stock option expense | $ 1,341,900 | $ 947,400
NOL carryforward | 11,524,900 | 10,509,900
Research and development credits | 1,623,100 | 1,656,500
Section 174 - R&D expenses | 1,046,400 | 0
Unrealized gain from investment in Alphazyme | 0 | (72,100)
Other | (78,200) | (6,100)
Deferred tax asset, net of deferred tax liabilities | 15,458,100 | 13,035,600
Valuation allowance | (15,458,100) | (13,035,600)
Net deferred tax asset | $ 0 | $ 0

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