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Note F - Segment Information - Segment Revenue Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Revenue, before fuel surcharges $ 252,630 $ 183,085 $ 709,246 $ 493,206
Freight Transportation Service [Member]        
Revenue, before fuel surcharges $ 216,475 $ 166,331 615,303 446,647
Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]        
Revenue, before fuel surcharges     $ 615,303 $ 446,647
Revenue, before fuel surcharges, percentage 100.00% 100.00% 100.00% 100.00%
Truckload Services [Member] | Freight Transportation Service [Member]        
Revenue, before fuel surcharges $ 144,982 $ 110,436    
Truckload Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]        
Revenue, before fuel surcharges     $ 404,658 $ 298,835
Revenue, before fuel surcharges, percentage 67.00% 66.40% 65.80% 66.90%
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member]        
Revenue, before fuel surcharges $ 71,493 $ 55,895    
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]        
Revenue, before fuel surcharges     $ 210,645 $ 147,812
Revenue, before fuel surcharges, percentage 33.00% 33.60% 34.20% 33.10%