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Note 11 - Earnings Per Share - Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Net income | $ 9,066 | $ 6,418 | $ 17,934 | $ 12,620
Weighted average common shares outstanding, basic (in shares) | 16,689,398 | 17,012,189 | 16,821,842 | 17,005,196
Total dilutive effect of potential common shares (in shares) | 99,217 | 70,643 | 91,030 | 70,765
Weighted average common shares outstanding, diluted (in shares) | 16,788,615 | 17,082,832 | 16,912,872 | 17,075,961
Basic earnings per common share (in dollars per share) | $ 0.54 | $ 0.38 | $ 1.06 | $ 0.74
Diluted earnings per common share (in dollars per share) | $ 0.54 | $ 0.38 | $ 1.06 | $ 0.74
Antidilutive potential common shares (in shares) | 1,793 | 76,868 | 867 | 63,038
Employee Stock Option [Member] |  |  |  |
Dilutive effect of potential common shares (in shares) | 69,914 | 47,591 | 62,384 | 50,356
Antidilutive potential common shares (in shares) |  | 71,592 |  | 59,473
Restricted Stock [Member] |  |  |  |
Dilutive effect of potential common shares (in shares) | 29,303 | 23,052 | 28,646 | 20,409
Antidilutive potential common shares (in shares) | 1,793 | 5,276 | 867 | 3,565

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