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Note 7 - Segment Information - Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Revenues from external customers $ 1,266,521 $ 1,178,568 $ 3,814,342 $ 3,467,743  
Segment operating income 90,169 42,868 219,185 101,066  
Segment income before taxes 91,849 43,928 223,235 98,109  
Segment assets 2,777,329 3,010,689 2,777,329 3,010,689 $ 2,985,393
Truck Segment [Member]          
Revenues from external customers 1,261,885 1,174,662 3,801,675 3,456,780  
Segment operating income 89,841 42,714 217,953 100,842  
Segment income before taxes 91,595 43,844 222,218 98,097  
Segment assets 2,722,614 2,965,188 2,722,614 2,965,188  
Other Segments [Member]          
Revenues from external customers 4,636 3,906 12,667 10,963  
Segment operating income 328 154 1,232 224  
Segment income before taxes 254 84 1,017 12  
Segment assets $ 54,715 $ 45,501 $ 54,715 $ 45,501