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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 9 Months Ended 12 Months Ended
Jun. 30, 2024
Sep. 30, 2024
Dec. 31, 2023
Lapsed or cancelled (in shares)   (199,984)  
Lapsed or cancelled, weighted average exercise price (in dollars per share)   $ 16.49  
Stock Appreciation Rights (SARs) [Member]      
Outstanding SARS (in shares) 292,508 292,508  
Outstanding (in dollars per share) $ 14.35 $ 14.35  
Outstanding SARS, weighted average remaining life (Year)   2 years 4 months 2 days 2 years 25 days
Outstanding SARS, aggregate intrinsic value   $ 832 $ 506
Granted SARs (in shares) [1] 79,128    
Granted SARS, weighted average exercise price (in dollars per share) [1] $ 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) (81,770)    
Lapsed or cancelled, weighted average exercise price (in dollars per share) $ 19.23    
Outstanding SARS (in shares) 271,946   292,508
Outstanding SARS, weighted average exercise price (in dollars per share) $ 13.12   $ 14.35
Exercisable (in shares) 137,742    
Exercisable, weighted average exercise price (in dollars per share) $ 13.37    
Exercisable SARS, weighted average remaining life (Year)   9 months 14 days  
Exercisable, aggregate intrinsic value   $ 479  
[1] The weighted average grant date fair value of SARs granted was $3.80 per share.