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Note F - Segment Information - Segment Revenue Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Revenue, before fuel surcharges $ 182,577 $ 201,502 $ 548,116 $ 630,639
Freight Transportation Service [Member]        
Revenue, before fuel surcharges $ 160,799 $ 174,348 481,980 549,885
Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]        
Revenue, before fuel surcharges     $ 481,980 $ 549,885
Revenue, before fuel surcharges, percentage 100.00% 100.00% 100.00% 100.00%
Truckload Services [Member] | Freight Transportation Service [Member]        
Revenue, before fuel surcharges $ 110,609 $ 112,257    
Truckload Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]        
Revenue, before fuel surcharges     $ 319,363 $ 357,681
Revenue, before fuel surcharges, percentage 68.80% 64.40% 66.30% 65.10%
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member]        
Revenue, before fuel surcharges $ 50,190 $ 62,091    
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]        
Revenue, before fuel surcharges     $ 162,617 $ 192,204
Revenue, before fuel surcharges, percentage 31.20% 35.60% 33.70% 34.90%