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Note F - Segment Information - Segment Revenue Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue, before fuel surcharges	$ 128,686	$ 119,458
Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 110,345	$ 99,104
Freight Transportation Service [Member] | Sales Revenue, Net [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges, percentage	100.00%	100.00%
Truckload Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 90,013	$ 80,524
Truckload Services [Member] | Freight Transportation Service [Member] | Sales Revenue, Net [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges, percentage	81.60%	81.30%
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 20,332	$ 18,580
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member] | Sales Revenue, Net [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges, percentage	18.40%	18.70%

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