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Note 12 - Common Stock and Stock-based Compensation Plans - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 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) 3 years 1 month 6 days 2 years 8 months 12 days
Outstanding, Aggregated intrinsic value $ 165 $ 765
Granted, Number of shares (in shares) 0  
Granted, weighted average exercise price (in dollars per share) $ 0  
Exercised, Number of shares (in shares) (27,000)  
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) 57,025 84,025
Outstanding, Weighted average exercise price (in dollars per share) $ 23.87 $ 22.45
Exercisable, Number of shares (in shares) 40,650  
Exercisable, Weighted average exercise price (in dollars per share) $ 25.13  
Exercisable, Weighted average remaining contractual term (Year) 2 years 2 months 12 days  
Exercisable, Aggregated intrinsic value $ 72