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Note 14 - Net Income Per Common Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net income $ 52,255 $ 66,287 $ 226,989 $ 198,153
Add: Convertible Notes interest expense, net of tax 1,561 0 3,575 0
Net income - diluted $ 53,816 $ 66,287 $ 230,564 $ 198,153
Basic (in shares) 6,019,517 6,001,561 6,015,450 5,844,330
Effect of dilutive equity-based compensation awards (in shares) [1] 37,110 48,854 38,257 53,115
Effect of dilution from if-converted Convertible Notes (in shares) [2] 404,248 0 309,029 0
Weighted average common shares outstanding - diluted (in shares) 6,460,875 6,050,415 6,362,736 5,897,445
Basic (in dollars per share) $ 8.68 $ 11.04 $ 37.73 $ 33.91
Diluted (in dollars per share) $ 8.33 $ 10.96 $ 36.24 $ 33.60
Anti-dilutive shares from equity-based compensation awards(1) (in shares) [2] 3,119 421 3,119 261
[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.
[2] Based on a conversion rate of 0.4394 shares of common stock per weighted $1,000 principal amount of Convertible Notes outstanding during the three and nine months ended September 30, 2021.