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Note 6 - Share-based Compensation - Stock-settled Stock Appreciation Rights Transactions (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Lapsed or cancelled (in shares) (174,478)  
Lapsed or cancelled, weighted average exercise price (in dollars per share) $ 16.26  
Stock Appreciation Rights (SARs) [Member]    
Outstanding SARS (in shares) 292,508  
Outstanding (in dollars per share) $ 14.35  
Outstanding SARS, weighted average remaining life (Year) 2 years 5 months 26 days 2 years 25 days
Outstanding SARS, aggregate intrinsic value $ 1,649 $ 506
Granted SARs (in shares) 79,128  
Granted SARS, weighted average exercise price (in dollars per share) $ 13.84  
Exercised SARs (in shares) (17,920)  
Exercised SARS, weighted average exercise price (in dollars per share) $ 8.48  
Lapsed or cancelled (in shares) (70,020)  
Lapsed or cancelled, weighted average exercise price (in dollars per share) $ 18.95  
Outstanding SARS (in shares) 283,696 292,508
Outstanding SARS, weighted average exercise price (in dollars per share) $ 13.44 $ 14.35
Exercisable (in shares) 149,492  
Exercisable, weighted average exercise price (in dollars per share) $ 13.96  
Exercisable SARS, weighted average remaining life (Year) 11 months 19 days  
Exercisable, aggregate intrinsic value $ 837