v3.26.3
Note 5 - Stockholders' Equity- Stock Option Activity (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Dec. 31, 2024
Outstanding, number of shares (in shares) 45,579 13,367  
Outstanding, weighted average exercise price (in dollars per share) $ 137.2 $ 317.75  
Outstanding, weighted average remaining contractual term (Year) 9 years 8 months 12 days 8 years 7 months 6 days 8 years 7 months 6 days
Outstanding, aggregate intrinsic value $ 23,958 $ 0 $ 58,500
Granted, number of shares (in shares) 266,200 32,212  
Granted, weighted average exercise price (in dollars per share) $ 1.18 $ 62  
Exercised, number of shares (in shares) 0 0  
Exercised, weighted average exercise price (in dollars per share) $ 0 $ 0  
Forfeited or expired, number of shares (in shares) (1,600) 0  
Forfeited or expired, weighted average exercise price (in dollars per share) $ 68.38 $ 0  
Outstanding, number of shares (in shares) 310,179 45,579 13,367
Outstanding, weighted average exercise price (in dollars per share) $ 20.82 $ 137.2 $ 317.75
Exercisable, number of shares (in shares) 22,130 9,531  
Exercisable, weighted average exercise price (in dollars per share) $ 217.73 $ 423.93  
Exercisable, weighted average remaining contractual term (Year) 7 years 9 months 18 days 7 years 2 months 12 days  
Exercisable, aggregate intrinsic value $ 0 $ 0