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Note F - Segment Information - Segment Revenue Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue, before fuel surcharges	$ 140,325	$ 108,899	$ 395,086	$ 326,949
Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 117,259	$ 93,457	$ 329,244	$ 280,157
Freight Transportation Service [Member] | Sales Revenue, Net [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges, percentage	100.00%	100.00%	100.00%	100.00%
Truckload Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 92,842	$ 79,736	$ 262,497	$ 244,311
Truckload Services [Member] | Freight Transportation Service [Member] | Sales Revenue, Net [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges, percentage	79.20%	85.30%	79.70%	87.20%
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 24,417	$ 13,721	$ 66,747	$ 35,846
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member] | Sales Revenue, Net [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges, percentage	20.80%	14.70%	20.30%	12.80%

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