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Note 5 - Stockholders' Equity- Stock Option Activity (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Outstanding, number of shares (in shares) 45,579  
Outstanding, weighted average exercise price (in dollars per share) $ 137.2  
Outstanding, weighted average remaining contractual term (Year) 9 years 8 months 12 days 8 years 7 months 6 days
Outstanding, aggregate intrinsic value $ 23,958 $ 0
Granted (in shares) 266,200  
Granted (in dollars per share) $ 1.18  
Exercised (in shares) 0  
Exercised (in dollars per share) $ 0  
Forfeited or expired (in shares) (1,600)  
Forfeited or expired (in dollars per share) $ 68.38  
Outstanding, number of shares (in shares) 310,179 45,579
Outstanding, weighted average exercise price (in dollars per share) $ 20.82 $ 137.2
Exercisable, number of shares (in shares) 22,130  
Exercise, weighted average exercise price (in dollars per share) $ 217.73  
Exercisable, weighted average remaining contractual term (Year) 7 years 9 months 18 days  
Exercisable, aggregate intrinsic value $ 0