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Note 12 - Common Stock and Stock-based Compensation Plans - Summary of Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Outstanding, Number of shares (in shares) 84,025  
Outstanding, Weighted average exercise price (in dollars per share) | $ / shares $ 22.45  
Outstanding, Weighted average remaining contractual term (Year) 3 years 3 months 18 days 2 years 8 months 12 days
Outstanding, Aggregated intrinsic value | $ $ 32 $ 765
Granted, Number of shares (in shares) 0  
Granted, weighted average exercise price (in dollars per share) | $ / shares $ 0  
Exercised, Number of shares (in shares) (27,000)  
Exercised, Weighted average exercise price (in dollars per share) | $ / shares $ 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) | $ / shares $ 23.87 $ 22.45
Exercisable, Number of shares (in shares) 38,773  
Exercisable, Weighted average exercise price (in dollars per share) | $ / shares $ 25.34  
Exercisable, Weighted average remaining contractual term (Year) 2 years 3 months 18 days  
Exercisable, Aggregated intrinsic value | $ $ 10