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
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Antidilutive securities (in shares) 9,575,795 1,831,298
Warrant [Member]    
Antidilutive securities (in shares) 3,263,632 1,461,997
Share-Based Payment Arrangement, Option [Member]    
Antidilutive securities (in shares) 271,064 369,301
Convertible Debt [Member]    
Antidilutive securities (in shares) 1,350,622 0
Series V Preferred Stock [Member]    
Antidilutive securities (in shares) 4,690,477 0