Quarterly report [Sections 13 or 15(d)]

Note 7 - Employee and Director Benefits - Summary of Stock Option Activity (Details)

v3.26.1
Note 7 - Employee and Director Benefits - Summary of Stock Option Activity (Details) - Share-Based Payment Arrangement, Option [Member] - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Outstanding, shares (in shares) 48,500 80,450 80,450  
Outstanding, weighted average exercise price (in dollars per share) $ 31.92 $ 26.03 $ 26.03  
Outstanding, weighted average remaining contractual term (Year) 2 years 2 months 12 days 2 years 2 years 1 year 10 months 24 days
Outstanding, aggregate intrinsic value $ 957 $ 3,732 $ 1,933 $ 4,723
Exercised, shares (in shares) (18,000) (12,250)    
Exercised, weighted average exercise price (in dollars per share) $ 28.05 $ 15.76    
Exercised, weighted average remaining contractual term (Year) 1 year 4 months 24 days      
Exercised, aggregate intrinsic value $ 806 $ 819    
Forfeited, shares (in shares) (5,500)      
Forfeited, weighted average exercise price (in dollars per share) $ 32.75      
Forfeited, weighted average remaining contractual term (Year) 10 months 24 days      
Forfeited, aggregate intrinsic value $ 220      
Outstanding, shares (in shares) 25,000 68,200 48,500 80,450
Outstanding, weighted average exercise price (in dollars per share) $ 34.53 $ 27.88 $ 31.92 $ 26.03
Exercisable, shares (in shares) 25,000 68,200    
Exercisable, weighted average exercise price (in dollars per share) $ 34.53 $ 27.88    
Exercisable, weighted average remaining contractual term (Year) 2 years 2 months 12 days 2 years    
Exercisable, aggregate intrinsic value $ 957 $ 3,732