v3.26.1
Note 9 - Common Stock and Stock-based Compensation Plans - Summary of Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
$ / shares
shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Outstanding, Number of shares (in shares) 57,025  
Outstanding, Weighted average exercise price (in dollars per share) | $ / shares $ 23.87  
Outstanding, Weighted average remaining contractual term (Year) 4 years 4 months 24 days 2 years 9 months 18 days
Outstanding, Aggregated intrinsic value | $ $ 788 $ 20
Granted, Number of shares (in shares) 0  
Granted, weighted average exercise price (in dollars per share) | $ / shares $ 0  
Exercised, Number of shares (in shares) (27,000)  
Exercised, Weighted average exercise price (in dollars per share) | $ / shares $ 27.17  
Forfeited or expired, Number of shares (in shares) 0  
Outstanding, Number of shares (in shares) 30,025 57,025
Outstanding, Weighted average exercise price (in dollars per share) | $ / shares $ 20.91 $ 23.87
Exercisable, Number of shares (in shares) 19,279  
Exercisable, Weighted average exercise price (in dollars per share) | $ / shares $ 21.04  
Exercisable, Weighted average remaining contractual term (Year) 4 years 3 months 18 days  
Exercisable, Aggregated intrinsic value | $ $ 503