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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, 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 7 months 6 days 2 years 6 months
Outstanding, Aggregated intrinsic value $ 213 $ 316
Exercised, Number of shares (in shares) (13,000)  
Exercised, Weighted average exercise price (in dollars per share) $ 14.77  
Outstanding, Number of shares (in shares) 86,425 99,425
Outstanding, Weighted average exercise price (in dollars per share) $ 21.64 $ 20.74
Exercisable, Number of shares (in shares) 67,000  
Exercisable, Weighted average exercise price (in dollars per share) $ 21.64  
Exercisable, Weighted average remaining contractual term (Year) 1 year 6 months  
Exercisable, Aggregated intrinsic value $ 192