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Note F - Segment Information - Segment Revenue Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue, before fuel surcharges	$ 237,168	$ 161,263	$ 456,616	$ 310,122
Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 202,739	$ 145,175	398,828	280,316
Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 398,828	$ 280,316
Revenue, before fuel surcharges, percentage	100.00%	100.00%	100.00%	100.00%
Truckload Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 134,698	$ 98,040
Truckload Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 259,676	$ 188,398
Revenue, before fuel surcharges, percentage	66.40%	67.50%	65.10%	67.20%
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 68,041	$ 47,135
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 139,152	$ 91,918
Revenue, before fuel surcharges, percentage	33.60%	32.50%	34.90%	32.80%

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