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Note 3 - Summary of Significant Accounting Policies - Outstanding Dilutive Securities (Details) - shares
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 3,591,038 3,246,091
Warrant [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 2,598,337 2,609,289
Convertible Preferred Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 992,701 636,802