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Note 11 - 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, 2025
Dec. 31, 2024
Outstanding, Number of shares (in shares) 84,025  
Outstanding, Weighted average exercise price (in dollars per share) $ 22.45  
Outstanding, Weighted average remaining contractual term (Year) 2 years 10 months 24 days 2 years 8 months 12 days
Outstanding, Aggregated intrinsic value $ 228 $ 765
Granted (in shares) 0  
Granted, weighted average exercise price (in dollars per share) $ 0  
Exercised, Number of shares (in shares) (13,000)  
Exercised, Weighted average exercise price (in dollars per share) $ 19.43  
Forfeited or expired, Number of shares (in shares) 0  
Outstanding, Number of shares (in shares) 71,025 84,025
Outstanding, Weighted average exercise price (in dollars per share) $ 23 $ 22.45
Exercisable, Number of shares (in shares) 48,689  
Exercisable, Weighted average exercise price (in dollars per share) $ 24.07  
Exercisable, Weighted average remaining contractual term (Year) 1 year 7 months 6 days  
Exercisable, Aggregated intrinsic value $ 117