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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Outstanding at the beginning of the year (in shares) [1] 642,253    
Outstanding, Weighted average exercise price (in dollars per share) $ 20.14    
Outstanding, Weighted average remaining contractual term (Year) 3 years 7 months 6 days [2] 3 years 6 months  
Outstanding, Aggregated intrinsic value $ 6,673 [2] $ 4,718  
Granted, Number of shares (in shares) 0 [1] 0 0
Exercised, Number of shares (in shares) [1] (353,163)    
Exercised, Weighted average exercise price (in dollars per share) $ 18.29    
Forfeited or expired, Number of shares (in shares) [1] (21)    
Forfeited or expired, Weighted average exercise price (in dollars per share) $ 16.20    
Outstanding, Number of shares (in shares) [1] 289,069 [2] 642,253  
Outstanding, Weighted average exercise price (in dollars per share) $ 22.42 [2] $ 20.14  
Exercisable, Number of shares (in shares) [1],[3] 289,069    
Exercisable, Weighted average exercise price (in dollars per share) [3] $ 22.42    
Exercisable, Weighted average remaining contractual term (Year) [3] 3 years 7 months 6 days    
Exercisable, Aggregated intrinsic value [3] $ 6,673    
[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] Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 280,427 shares of the Company's common stock issuable upon exercise.
[3] Due to the ceiling imposed on the SAR grants, the exercisable amount equals a maximum of 280,427 shares of the Company's common stock issuable upon exercise.