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Note 6 - Segment Information - Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Revenues from external customers $ 2,027,028 $ 2,003,052 $ 3,899,027 $ 3,914,819  
Segment operating income 124,481 142,859 235,091 270,635  
Segment income before taxes 105,061 130,525 197,875 249,665  
Segment assets 4,506,526 4,126,321 4,506,526 4,126,321 $ 4,364,241
Truck Segment [Member]          
Revenues from external customers 2,022,756 1,999,028 3,890,803 3,906,969  
Segment operating income 124,553 142,869 235,340 270,432  
Segment income before taxes 105,133 130,535 198,124 249,462  
Segment assets 4,446,418 4,070,544 4,446,418 4,070,544  
Other Operating Segment [Member]          
Revenues from external customers 4,272 4,024 8,224 7,850  
Segment operating income   (10) (249) 203  
Segment income before taxes (72) (10) (249) 203  
Segment assets $ 60,108 $ 55,777 $ 60,108 $ 55,777