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Note 9 - Stockholders' Equity - Warrants (Details) - shares
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Balance, Warrants (in shares) 4,490,104 126,875
Warrants issued (in shares) 531,250 4,363,229
Exercises and conversions (in shares) 0 0
Balance, Warrants (in shares) 5,021,354 4,490,104