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Note 9 - Goodwill and Intangible Assets - Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Balance $ 1,409,674 $ 855,228
Acquisitions of businesses, net 22,565 578,061
Foreign currency translation (31,359) (23,615)
Balance 1,400,880 1,409,674
Goodwill, gross 1,908,684 1,917,478
Accumulated impairment (507,804) (507,804)
Goodwill 1,400,880 1,409,674
Domestic [Member]    
Balance 995,444 702,535
Acquisitions of businesses, net 22,128 293,614
Foreign currency translation (915) (705)
Balance 1,016,657 995,444
Goodwill, gross 1,519,850 1,498,637
Accumulated impairment (503,193) (503,193)
Goodwill 1,016,657 995,444
International [Member]    
Balance 414,230 152,693
Acquisitions of businesses, net 437 284,447
Foreign currency translation (30,444) (22,910)
Balance 384,223 414,230
Goodwill, gross 388,834 418,841
Accumulated impairment (4,611) (4,611)
Goodwill $ 384,223 $ 414,230