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Note 13 - Net Income Per Common Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net income $ 62,540 $ 36,395 $ 131,866 $ 75,134
Basic (in shares) 5,831,796 5,673,669 5,764,850 5,673,893
Effect of dilutive equity-based compensation awards (in shares) [1] 51,621 56,569 54,783 49,403
Diluted (in shares) 5,883,417 5,730,238 5,819,633 5,723,296
Basic (in dollars per share) $ 10.72 $ 6.41 $ 22.87 $ 13.24
Diluted (in dollars per share) $ 10.63 $ 6.35 $ 22.66 $ 13.13
Anti-dilutive shares from equity-based compensation awards (in shares) [1] 506 87 363 3,895
[1] Equity-based compensation awards whose impact is considered to be anti-dilutive under the treasury stock method were excluded from the diluted net income per common share calculation.