v3.26.1
Note 5 - Share-Based Compensation - Schedule of Option Activity (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Outstanding (in shares) 4,641,685  
Outstanding, weighted average exercise price (in dollars per share) $ 3.72  
Outstanding, weighted average contractual life (Year) 6 years 6 years 2 months 12 days
Outstanding, aggregate intrinsic value $ 0 $ 200
Granted (in shares) 351,326  
Granted, weighted average exercise price (in dollars per share) $ 1.39  
Outstanding (in shares) 4,993,011 4,641,685
Outstanding, weighted average exercise price (in dollars per share) $ 3.56 $ 3.72
Options exercisable (in shares) 3,767,547  
Options exercisable, weighted average exercise price (in dollars per share) $ 3.58  
Options exercisable, weighted average contractual life (Year) 5 years 9 months 18 days  
Options exercisable, aggregate intrinsic value $ 0  
Options vested or expected to vest (in shares) 4,971,465  
Options vested or expected to vest, weighted average exercise price (in dollars per share) $ 3.55  
Options vested or expected to vest, weighted average contractual life (Year) 6 years  
Options vested or expected to vest, aggregate intrinsic value $ 0