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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
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Outstanding, Number of shares (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 8 months 12 days [2] 3 years 6 months
Outstanding, Aggregated intrinsic value $ 5,349 [2] $ 4,718
Granted, Number of shares (in shares) [1] 0  
Exercised, Number of shares (in shares) [1] (333,980)  
Exercised, Weighted average exercise price (in dollars per share) $ 18.42  
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] 308,252 [2] 642,253
Outstanding, Weighted average exercise price (in dollars per share) $ 22.02 [2] $ 20.14
Exercisable, Number of shares (in shares) [1],[3] 298,752  
Exercisable, Weighted average exercise price (in dollars per share) [3] $ 21.74  
Exercisable, Weighted average remaining contractual term (Year) [3] 3 years 7 months 6 days  
Exercisable, Aggregated intrinsic value [3] $ 5,266  
[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 294,814 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 285,314 shares of the Company's common stock issuable upon exercise.