v3.26.1
Note 9 - Common Stock and Stock-based Compensation Plans - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Outstanding, Number of shares (in shares) 57,025  
Outstanding, Weighted average exercise price (in dollars per share) $ 23.87  
Outstanding, Weighted average remaining contractual term (Year) 2 years 7 months 6 days 2 years 9 months 18 days
Outstanding, Aggregated intrinsic value $ 0 $ 20
Granted, Number of shares (in shares) 0  
Granted, weighted average exercise price (in dollars per share) $ 0  
Exercised, Number of shares (in shares) 0  
Exercised, Weighted average exercise price (in dollars per share) $ 0  
Forfeited or expired, Number of shares (in shares) 0  
Outstanding, Number of shares (in shares) 57,025 57,025
Outstanding, Weighted average exercise price (in dollars per share) $ 23.87 $ 23.87
Exercisable, Number of shares (in shares) 44,403  
Exercisable, Weighted average exercise price (in dollars per share) $ 24.77  
Exercisable, Weighted average remaining contractual term (Year) 1 year 10 months 24 days  
Exercisable, Aggregated intrinsic value $ 0