Annual report [Section 13 and 15(d), not S-K Item 405]

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
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Antidilutive securities (in shares) 3,551,642 1,832,613
Warrant [Member]    
Antidilutive securities (in shares) 3,254,578 1,463,312
Share-Based Payment Arrangement, Option [Member]    
Antidilutive securities (in shares) 297,064 369,301