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Note 7 - Segment Information - Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Revenues from external customers $ 1,791,241 $ 1,316,015 $ 3,354,443 $ 2,547,821  
Segment operating income 135,023 72,791 242,522 129,016  
Segment income before taxes 140,188 74,749 260,532 131,386  
Segment assets 3,669,369 2,912,124 3,669,369 2,912,124 $ 3,119,977
Truck Segment [Member]          
Revenues from external customers 1,786,927 1,311,678 3,345,979 2,539,790  
Segment operating income 134,506 72,163 241,826 128,113  
Segment income before taxes 139,765 74,191 260,023 130,623  
Segment assets 3,615,745 2,863,087 3,615,745 2,863,087  
Other Segments [Member]          
Revenues from external customers 4,314 4,337 8,464 8,031  
Segment operating income 517 628 696 903  
Segment income before taxes 423 558 509 763  
Segment assets $ 53,624 $ 49,037 $ 53,624 $ 49,037