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Note 7 - Segment Reporting Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Truck Segment [Member]        
Revenues from external customers $ 1,326,360,000 $ 1,177,306,000 $ 2,516,347,000 $ 2,131,936,000
Segment income (loss) before taxes 32,159,000 32,112,000 59,911,000 52,093,000
Segment assets 2,715,032,000 2,321,639,000 2,715,032,000 2,321,639,000
Other Segments [Member]        
Revenues from external customers 3,943,000 5,155,000 7,491,000 9,192,000
Segment income (loss) before taxes (197,000) 277,000 (561,000) (89,000)
Segment assets 31,984,000 31,925,000 31,984,000 31,925,000
Revenues from external customers 1,330,303,000 1,182,461,000 2,523,838,000 2,141,128,000
Segment income (loss) before taxes 31,962,000 32,389,000 59,350,000 52,004,000
Segment assets $ 2,747,016,000 $ 2,353,564,000 $ 2,747,016,000 $ 2,353,564,000