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Note 8 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Net operating loss carryforward $ 19,764,569 $ 18,449,694
Research and development tax credit carryforward 2,202,603 1,566,293
Stock-based compensation expense 330,553 129,475
Accrued expenses 663,211 69,940
Total deferred tax assets 22,960,936 20,215,402
Depreciation 51,466 30,945
Net deferred tax assets 22,909,470 20,184,457
Valuation allowance (22,909,470) (20,184,457)
Net deferred tax asset after reduction for valuation allowance $ (0) $ (0)