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Note 13 - Income Taxes - Effective Income Tax rate (Details)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
U.S. federal statutory rate, beginning of year 21.00% 21.00%
Common stock warrant liabilities (2.00%) 0.00%
Officers' compensation (1.00%) 0.00%
Other (1.00%) (4.00%)
Valuation allowance (17.00%) (17.00%)
Effective tax rate as reported 0.00% 0.00%