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Note F - Segment Information - Segment Revenue Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue, before fuel surcharges	$ 183,085	$ 121,942	$ 493,206	$ 344,075
Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 166,331	$ 109,854	446,647	307,441
Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 446,647	$ 307,441
Revenue, before fuel surcharges, percentage	100.00%	100.00%	100.00%	100.00%
Truckload Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 110,436	$ 82,949
Truckload Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 298,835	$ 244,217
Revenue, before fuel surcharges, percentage	66.40%	75.50%	66.90%	79.40%
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 55,895	$ 26,905
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 147,812	$ 63,224
Revenue, before fuel surcharges, percentage	33.60%	24.50%	33.10%	20.60%

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