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Note F - Segment Information - Segment Revenue Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue, before fuel surcharges	$ 135,302	$ 108,646	$ 254,761	$ 218,050
Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 112,881	$ 93,097	$ 211,985	$ 186,700
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	$ 89,131	$ 81,656	$ 169,655	$ 164,575
Truckload Services [Member] | Freight Transportation Service [Member] | Sales Revenue, Net [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges, percentage	79.00%	87.70%	80.00%	88.10%
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 23,750	$ 11,441	$ 42,330	$ 22,125
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member] | Sales Revenue, Net [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges, percentage	21.00%	12.30%	20.00%	11.90%

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