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Note 3 - Acquisitions - Unaudited Pro Forma Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net sales $ 1,067,071 $ 942,698 $ 919,981 $ 807,434 $ 761,082 $ 701,355 $ 546,848 $ 475,915 $ 3,737,184 $ 2,485,200 $ 2,204,336
As reported $ 142,895 $ 131,570 $ 127,036 $ 148,993 $ 125,001 $ 114,970 $ 66,145 $ 44,460 $ 550,494 $ 350,576 $ 252,007
As reported (in dollars per share) $ 2.04 $ 1.93 $ 2.01 $ 2.33 $ 1.96 $ 1.82 $ 1.02 $ 0.68 $ 8.30 $ 5.48 $ 4.03
Pro Forma [Member]                      
Net sales                 $ 3,877,995 $ 2,712,813 $ 2,408,671
As reported [1]                 $ 465,983 $ 276,579 $ 135,778
As reported (in dollars per share)                 $ 7.16 $ 4.29 $ 2.15
[1] Includes additional intangible amortization from the effect of all acquisitions as though the transactions had occurred on January 1, 2019 of $63,524, $78,840, and $83,100 million for the years ended December 31, 2021, 2020, and 2019, respectively