v3.26.1
Note 5 - Share-based Compensation - Stock Option Activity Under Equity Incentive Plans and Director Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) 9,145 10,014
Service based Stock Options [Member]    
Beginning balance, outstanding, number of options (in shares) 608,782  
Beginning balance, outstanding, weighted average exercise price (in dollars per share) $ 27.52  
Granted, number of options (in shares) 17,638 11,021
Granted, weighted average exercise price (in dollars per share) $ 22.01  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) 9,145  
Exercised, weighted average exercise price (in dollars per share) $ 15.23  
Expired, number (in shares) 0  
Forfeited, number of options (in shares) 0  
Outstanding, number (in shares) 617,275  
Outstanding, weighted average exercise price (in dollars per share) $ 27.54  
Outstanding, weighted average contractual term (Year) 7 years 18 days  
Outstanding, aggregate intrinsic value $ 0  
Exercisable, number (in shares) 401,138  
Exercisable, weighted average exercise price (in dollars per share) $ 33.13  
Exercisable, weighted average remaining contractual term (Year) 6 years 2 months 1 day  
Exercisable, aggregate intrinsic value $ 0