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Note 7 - Segment Information - Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Revenues from external customers $ 1,563,202 $ 1,231,806  
Segment operating income 107,499 56,225  
Segment income before taxes 120,344 56,637  
Segment assets 3,321,548 3,008,423 $ 3,119,977
Truck Segment [Member]      
Revenues from external customers 1,559,051 1,228,111  
Segment operating income 107,320 55,950  
Segment income before taxes 120,259 56,432  
Segment assets 3,266,895 2,958,832  
Other Segments [Member]      
Revenues from external customers 4,151 3,695  
Segment operating income 179 275  
Segment income before taxes 85 205  
Segment assets $ 54,653 $ 49,591