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Note 9 - Stockholders' Equity - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2022
Outstanding, Number of shares (in shares) 84,025    
Outstanding, Weighted average exercise price (in dollars per share) $ 20.74    
Outstanding, Weighted average remaining contractual term (Year) 2 years 9 months 18 days 2 years 6 months  
Outstanding, Aggregated intrinsic value $ 20 $ 316  
Granted, Number of shares (in shares) 0   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    
Forfeited or expired, Weighted average exercise price (in dollars per share) $ 0    
Outstanding, Number of shares (in shares) 57,025 84,025  
Outstanding, Weighted average exercise price (in dollars per share) $ 23.87 $ 20.74  
Exercisable, Number of shares (in shares) 42,526    
Exercisable, Weighted average exercise price (in dollars per share) $ 24.95    
Exercisable, Weighted average remaining contractual term (Year) 2 years 1 month 6 days    
Exercisable, Aggregated intrinsic value $ 8