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Note 10 - Common Stock and Stock-based Compensation Plans - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Outstanding, Number of shares (in shares) [1] 702,817  
Outstanding, Weighted average exercise price (in dollars per share) $ 19.95 [2] $ 19.88
Outstanding, Weighted average remaining contractual term (Year) 4 years 36 days [2] 4 years 109 days
Outstanding, Aggregated intrinsic value $ 5,142 [2] $ 2,708
Granted, Number of shares (in shares) [1]  
Exercised, Number of shares (in shares) [1] (17,963)  
Exercised, Weighted average exercise price (in dollars per share) $ 17.09  
Forfeited or expired, Number of shares (in shares) [1] (375)  
Forfeited or expired, Weighted average exercise price (in dollars per share) $ 24.86  
Outstanding, Number of shares (in shares) [1] 684,479 [2] 702,817
Exercisable, Number of shares (in shares) [1],[3] 610,513  
Exercisable, Weighted average exercise price (in dollars per share) [3] $ 19.22  
Exercisable, Weighted average remaining contractual term (Year) [3] 3 years 292 days  
Exercisable, Aggregated intrinsic value [3] $ 4,993  
[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 628,547 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 555,947 shares of the Company's common stock issuable upon exercise.