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Note F - Segment Information - Segment Revenue Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue, before fuel surcharges	$ 133,000	$ 135,302	$ 261,686	$ 254,761
Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 112,352	$ 112,881	222,696	211,985
Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 222,696	$ 211,985
Revenue, before fuel surcharges, percentage	100.00%	100.00%	100.00%	100.00%
Truckload Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 92,867	$ 89,131
Truckload Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 182,879	$ 169,655
Revenue, before fuel surcharges, percentage	82.70%	79.00%	82.10%	80.00%
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 19,485	$ 23,750
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 39,817	$ 42,330
Revenue, before fuel surcharges, percentage	17.30%	21.00%	17.90%	20.00%

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