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Note 9 - Stockholders' Equity - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2019
Outstanding, Number of shares (in shares) [1] 126,000    
Outstanding, Weighted average exercise price (in dollars per share) $ 20.06    
Outstanding, Weighted average remaining contractual term (Year) 2 years 2 years 7 months 6 days  
Outstanding, Aggregated intrinsic value $ 609 $ 2,921  
Granted, Number of shares (in shares) 0 [1]   0
Exercised, Number of shares (in shares) [1] (19,000)    
Exercised, Weighted average exercise price (in dollars per share) $ 18.79    
Forfeited or expired, Number of shares (in shares) [1] (1,000)    
Outstanding, Number of shares (in shares) [1] 106,000 [2] 126,000  
Outstanding, Weighted average exercise price (in dollars per share) $ 20.24 $ 20.06  
Exercisable, Number of shares (in shares) [1] 106,000    
Exercisable, Weighted average exercise price (in dollars per share) $ 20.24    
Exercisable, Weighted average remaining contractual term (Year) 2 years    
Exercisable, Aggregated intrinsic value $ 609    
[1] 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.
[2] 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.