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Note 7 - Segment Information (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   

Truck

Segment

   

All Other

   

Total

 
                         

As of and for the three months ended September 30, 2021

                       
                         

Revenues from external customers

  $ 1,261,885     $ 4,636     $ 1,266,521  

Segment operating income

    89,841       328       90,169  

Segment income before taxes

    91,595       254       91,849  

Segment assets

    2,722,614       54,715       2,777,329  
                         

For the nine months ended September 30, 2021

                       
                         

Revenues from external customers

  $ 3,801,675     $ 12,667     $ 3,814,342  

Segment operating income

    217,953       1,232       219,185  

Segment income before taxes

    222,218       1,017       223,235  
                         

As of and for the three months ended September 30, 2020

                       
                         

Revenues from external customers

  $ 1,174,662     $ 3,906     $ 1,178,568  

Segment operating income

    42,714       154       42,868  

Segment income before taxes

    43,844       84       43,928  

Segment assets

    2,965,188       45,501       3,010,689  
                         

For the nine months ended September 30, 2020

                       
                         

Revenues from external customers

  $ 3,456,780     $ 10,963     $ 3,467,743  

Segment operating income

    100,842       224       101,066  

Segment income before taxes

    98,097       12       98,109