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Note F - Segment Information - Segment Revenue Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue, before fuel surcharges	$ 207,412	$ 237,168	$ 429,136	$ 456,616
Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 182,082	$ 202,739	375,536	398,828
Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 375,536	$ 398,828
Revenue, before fuel surcharges, percentage	100.00%	100.00%	100.00%	100.00%
Truckload Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 120,226	$ 134,698
Truckload Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 245,424	$ 259,676
Revenue, before fuel surcharges, percentage	66.00%	66.40%	65.40%	65.10%
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 61,856	$ 68,041
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 130,112	$ 139,152
Revenue, before fuel surcharges, percentage	34.00%	33.60%	34.60%	34.90%

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