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Note 3 - Acquisitions - Business Acquisitions, Pro Forma Revenue and Earnings (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Actual from acquired entities for 2017, Revenues $ 215,174  
Actual from acquired entities for 2017, Net earnings from continuing operations 7,377  
Supplemental pro forma revenues (unaudited), Revenues 2,299,891 $ 2,150,685
Supplemental pro forma net earnings (unaudited), Net earnings from continuing operations $ 93,145 $ 100,105