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Note 3 - Acquisitions and Dispositions - Unaudited Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Acquisitions Completed in 2017 [Member] |  |
Revenue (less agency commissions) | $ 895,081 | $ 926,799
Net income | $ 260,909 | $ 88,679
Basic net income per share (in dollars per share) | $ 3.57 | $ 1.23
Diluted net income per share (in dollars per share) | $ 3.53 | $ 1.22
Acquisitions Completed in 2016 [Member] |  |
Revenue (less agency commissions) |  | $ 825,787
Net income |  | $ 57,795
Basic net income per share (in dollars per share) |  | $ 0.80
Diluted net income per share (in dollars per share) |  | $ 0.79

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