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Note 9 - Net Loss Per Share - Anti-dilutive Securities (Details) - shares
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Stock options to purchase common stock (in shares) 2,635,288 371,601
Share-Based Payment Arrangement, Option [Member]    
Stock options to purchase common stock (in shares) 168,184 162,607
Warrant [Member]    
Stock options to purchase common stock (in shares) 2,467,104 208,994