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Note F - Segment Information - Segment Revenue Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue, before fuel surcharges	$ 128,994	$ 140,325	$ 390,680	$ 395,086
Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 110,149	$ 117,259	332,846	329,244
Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 332,845	$ 329,244
Revenue, before fuel surcharges, percentage	100.00%	100.00%	100.00%	100.00%
Truckload Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 92,443	$ 92,842
Truckload Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 275,322	$ 262,497
Revenue, before fuel surcharges, percentage	83.90%	79.20%	82.70%	79.70%
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 17,706	$ 24,417
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 57,523	$ 66,747
Revenue, before fuel surcharges, percentage	16.10%	20.80%	17.30%	20.30%

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