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Note 3 - Summary of Significant Accounting Policies - Outstanding Dilutive Securities (Details) - shares
9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Preferred Series A-2 (in shares) 3,167,027 927,797
Warrant [Member]    
Preferred Series A-2 (in shares) 2,633,868 598,457
Convertible Preferred Stock [Member]    
Preferred Series A-2 (in shares) 533,159 329,340