Quarterly report [Sections 13 or 15(d)]

Note 2 - Summary of Significant Accounting Policies - Antidilutive Securities (Details)

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Note 2 - Summary of Significant Accounting Policies - Antidilutive Securities (Details) - shares
9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Antidilutive securities (in shares) 11,571,602 3,558,471
Warrant [Member]    
Antidilutive securities (in shares) 4,244,287 1,460,199
Share-Based Payment Arrangement, Option [Member]    
Antidilutive securities (in shares) 273,257 285,928
Convertible Debt [Member]    
Antidilutive securities (in shares) 2,363,581 405,201
Series V Preferred Stock [Member]    
Antidilutive securities (in shares) 4,690,477 1,407,143