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Note 11 - Net Loss Per Share - Anti-dilutive Securities (Details) - shares
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Stock options to purchase common stock (in shares) 2,635,288 307,673
Share-Based Payment Arrangement, Option [Member]    
Stock options to purchase common stock (in shares) 168,184 165,784
Restricted Stock Units (RSUs) [Member]    
Stock options to purchase common stock (in shares) 0 0
Warrant [Member]    
Stock options to purchase common stock (in shares) 2,467,104 141,889