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Note 7 - Segment Reporting Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Truck Segment [Member]
Revenues from external customers	$ 1,289,929,000	$ 1,236,101,000	$ 3,806,276,000	$ 3,368,037,000
Segment income (loss) before taxes	33,069,000	38,366,000	92,981,000	90,459,000
Segment assets	2,837,256,000	2,426,368,000	2,837,256,000	2,426,368,000
Other Segments [Member]
Revenues from external customers	4,147,000	4,921,000	11,638,000	14,113,000
Segment income (loss) before taxes	(607,000)	(37,000)	(1,169,000)	(126,000)
Segment assets	33,234,000	30,244,000	33,234,000	30,244,000
Revenues from external customers	1,294,076,000	1,241,022,000	3,817,914,000	3,382,150,000
Segment income (loss) before taxes	32,462,000	38,329,000	91,812,000	90,333,000
Segment assets	$ 2,870,490,000	$ 2,456,612,000	$ 2,870,490,000	$ 2,456,612,000