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Note 7 - Segment Information - Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Revenues from external customers $ 1,002,512 $ 1,544,561 $ 2,289,175 $ 2,892,878  
Segment operating income 23,001 61,792 58,198 118,659  
Segment income before taxes 22,512 54,410 54,181 103,968  
Segment assets 3,064,601 3,530,695 3,064,601 3,530,695 $ 3,407,329
Truck Segment [Member]          
Revenues from external customers 998,739 1,540,237 2,282,118 2,884,686  
Segment operating income 22,678 61,579 58,129 118,321  
Segment income before taxes 22,260 54,269 54,253 103,774  
Segment assets 3,021,241 3,490,254 3,021,241 3,490,254  
Other Segments [Member]          
Revenues from external customers 3,773 4,324 7,057 8,192  
Segment operating income 323 213 69 338  
Segment income before taxes 252 141 (72) 194  
Segment assets $ 43,360 $ 40,441 $ 43,360 $ 40,441