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Note F - Segment Information - Segment Revenue Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue, before fuel surcharges	$ 221,724	$ 219,448
Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 193,454	$ 196,089
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	$ 125,198	$ 124,978
Truckload Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges, percentage	64.70%	63.70%
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 68,256	$ 71,111
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges, percentage	35.30%	36.30%

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