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Note F - Segment Information - Segment Revenue Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue, before fuel surcharges	$ 161,263	$ 92,979	$ 310,122	$ 222,134
Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 145,175	$ 85,765	280,316	197,587
Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 280,316	$ 197,587
Revenue, before fuel surcharges, percentage	100.00%	100.00%	100.00%	100.00%
Truckload Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 98,040	$ 69,958
Truckload Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 188,398	$ 161,268
Revenue, before fuel surcharges, percentage	67.50%	81.60%	67.20%	81.60%
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 47,135	$ 15,807
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 91,918	$ 36,319
Revenue, before fuel surcharges, percentage	32.50%	18.40%	32.80%	18.40%

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