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Note F - Segment Information - Segment Revenue Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenue, before fuel surcharges $ 150,264 $ 182,577 $ 456,740 $ 548,116
Operating revenues 150,264 182,577 456,740 548,116
Freight Transportation Service [Member]        
Revenue, before fuel surcharges 132,948 160,799 403,455 481,980
Operating revenues $ 132,948 $ 160,799 403,455 481,980
Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]        
Revenue, before fuel surcharges     $ 403,455 $ 481,980
Revenue, before fuel surcharges, percentage 100.00% 100.00% 100.00% 100.00%
Operating revenues     $ 403,455 $ 481,980
Truckload Services [Member] | Freight Transportation Service [Member]        
Revenue, before fuel surcharges $ 91,189 $ 110,609    
Operating revenues $ 91,189 $ 110,609    
Truckload Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]        
Revenue, before fuel surcharges     $ 276,442 $ 319,363
Revenue, before fuel surcharges, percentage 68.60% 68.80% 68.50% 66.30%
Operating revenues     $ 276,442 $ 319,363
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member]        
Revenue, before fuel surcharges $ 41,759 $ 50,190    
Operating revenues $ 41,759 $ 50,190    
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]        
Revenue, before fuel surcharges     $ 127,013 $ 162,617
Revenue, before fuel surcharges, percentage 31.40% 31.20% 31.50% 33.70%
Operating revenues     $ 127,013 $ 162,617