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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, 2024
Dec. 31, 2023
Outstanding, Number of shares (in shares) 99,425  
Outstanding, Weighted average exercise price (in dollars per share) $ 20.74  
Outstanding, Weighted average remaining contractual term (Year) 2 years 8 months 12 days 2 years 6 months
Outstanding, Aggregated intrinsic value $ 765 $ 316
Granted, Number of shares (in shares) 10,600  
Granted, weighted average exercise price (in dollars per share) $ 19.61  
Exercised, Number of shares (in shares) (26,000)  
Exercised, Weighted average exercise price (in dollars per share) $ 14.77  
Forfeited or expired, Number of shares (in shares) 0  
Outstanding, Number of shares (in shares) 84,025 99,425
Outstanding, Weighted average exercise price (in dollars per share) $ 22.45 $ 20.74
Exercisable, Number of shares (in shares) 60,475  
Exercisable, Weighted average exercise price (in dollars per share) $ 23.12  
Exercisable, Weighted average remaining contractual term (Year) 1 year 6 months  
Exercisable, Aggregated intrinsic value $ 510