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Note 15 - 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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Net income $ 70,607 $ 52,255 $ 311,328 $ 226,989
Add: Convertible Notes interest expense, net of tax 1,561 1,561 4,655 3,575
Net income - diluted $ 72,168 $ 53,816 $ 315,983 $ 230,564
Basic (in shares) 5,836,731 6,019,517 5,933,372 6,015,450
Effect of dilutive equity-based compensation awards (in shares) [1] 20,278 37,110 20,335 38,257
Effect of dilution from if-converted Convertible Notes (in shares) [2] 404,248 404,248 404,248 309,029
Weighted average common shares outstanding - diluted (in shares) 6,261,257 6,460,875 6,357,955 6,362,736
Basic (in dollars per share) $ 12.10 $ 8.68 $ 52.47 $ 37.73
Diluted (in dollars per share) $ 11.53 $ 8.33 $ 49.70 $ 36.24
Anti-dilutive shares from equity-based compensation awards(1) (in shares) 13,068 3,119 13,068 3,119
[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 all periods presented.