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Note 8 - Stockholders' Equity - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Outstanding, Number of shares (in shares) [1] 729,017  
Outstanding, Weighted average exercise price (in dollars per share) $ 19.88 [2] $ 19.77
Outstanding, Weighted average remaining contractual term (Year) 4 years 109 days [2] 5 years 73 days
Outstanding, Aggregate intrinsic value $ 2,708 [2] $ 19,229
Granted, Number of shares (in shares) 0 0
Exercised, Number of shares (in shares) [1] (22,530)  
Exercised, Weighted average exercise price (in dollars per share) $ 16.07  
Forfeited or expired, Number of shares (in shares) [1] (3,670)  
Forfeited or expired, Weighted average exercise price (in dollars per share) $ 22.67  
Outstanding, Number of shares (in shares) [1] 702,817 [2] 729,017
Exercisable, Number of shares (in shares) [1],[3] 623,718  
Exercisable, Weighted average exercise price (in dollars per share) [3] $ 19.14  
Exercisable, Weighted average remaining contractual term (Year) [3] 4 years  
Exercisable, Aggregate intrinsic value [3] $ 2,648  
[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 642,300 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 565,851 shares of the Company's common stock issuable upon exercise.