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Note 11 - Loss Per Share (Details Textual) - shares
6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Restricted Stock Units (RSUs) [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 537,693 405,553
Prefunded Warrants [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 5,299,879 3,930,008
Warrant [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 6,091,346 1,091,346