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Note 5 - Stockholders' Equity - Share-Based Payment Arrangement, Option, Activity (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Outstanding, number of shares (in shares) 333,648  
Outstanding, weighted average exercise price (in dollars per share) $ 12.71  
Outstanding, weighted average remaining contractual term (Year) 9 years 4 months 24 days 8 years 7 months 6 days
Outstanding, aggregate intrinsic value $ 0 $ 58,500
Granted, number of shares (in shares) 805,300  
Granted, weighted average exercise price (in dollars per share) $ 2.48  
Outstanding, number of shares (in shares) 1,138,948 333,648
Outstanding, weighted average exercise price (in dollars per share) $ 5.48 $ 12.71
Exercisable, number of shares (in shares) 117,905  
Exercisable, weighted average exercise price (in dollars per share) $ 30.67  
Exercisable, weighted average remaining contractual term (Year) 6 years 9 months 18 days  
Exercisable, aggregate intrinsic value $ 0