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Note F - Segment Information - Segment Revenue Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue, before fuel surcharges	$ 219,448	$ 148,858
Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 196,089	$ 135,141
Freight Transportation Service [Member] | Revenue Benchmark [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	$ 124,978	$ 90,359
Truckload Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges, percentage	63.70%	66.90%
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 71,111	$ 44,782
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges, percentage	36.30%	33.10%

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