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Note 6 - Segment Information - Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Revenues from external customers $ 1,911,767 $ 1,563,202  
Segment operating income 127,776 107,499  
Segment income before taxes 119,140 120,344  
Segment assets 3,969,552 3,321,548 $ 3,821,066
Truck Segment [Member]      
Revenues from external customers 1,907,941 1,559,051  
Segment operating income 127,563 107,320  
Segment income before taxes 118,927 120,259  
Segment assets 3,913,928 3,266,895  
Other Segments [Member]      
Revenues from external customers 3,826 4,151  
Segment operating income   179  
Segment income before taxes 213 85  
Segment assets $ 55,624 $ 54,653