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Note 4 - Income Taxes - Component of Deferred Tax Assets (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Section 174 - R&D expenses | $ 1,769,000 | $ 1,046,400
Stock option expense | 1,419,300 | 1,341,900
NOL carryforward | 11,620,700 | 11,524,900
Research and development credits | 1,503,600 | 1,623,100
Operating lease liability | 34,700 | 0
Right-of-use asset | (35,800) | 0
Other | 134,800 | (78,200)
Deferred tax asset, net of deferred tax liabilities | 16,446,300 | 15,458,100
Valuation allowance | (16,446,300) | (15,458,100)
Net deferred tax asset | $ 0 | $ 0

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