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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
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Outstanding, Number of shares (in shares) [1],[2] 106,000  
Outstanding, Weighted average exercise price (in dollars per share) $ 20.24  
Outstanding, Weighted average remaining contractual term (Year) 2 years 2 years
Outstanding, Aggregated intrinsic value $ 446 $ 609
Exercised, Number of shares (in shares) [2] (26,000)  
Exercised, Weighted average exercise price (in dollars per share) $ 19.36  
Outstanding, Number of shares (in shares) 80,000 106,000 [1],[2]
Outstanding, Weighted average exercise price (in dollars per share) $ 20.53 $ 20.24
Exercisable, Number of shares (in shares) [2] 80,000  
Exercisable, Weighted average exercise price (in dollars per share) $ 20.53  
Exercisable, Weighted average remaining contractual term (Year) 2 years  
Exercisable, Aggregated intrinsic value $ 446  
[1] Represent options granted to non-employee directors of the Company only. As of December 31, 2022, there were no outstanding or exercisable SAR units left and no outstanding or exercisable options granted to employees left.
[2] The SAR units are convertible for a maximum number of shares of the Company’s common stock equal to 75% of the SAR units subject to the grant.