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Note F - Segment Information - Segment Revenue Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Revenue, before fuel surcharges $ 151,134 $ 182,948 $ 306,475 $ 365,540
Operating revenues 151,134 182,948 306,475 365,540
Freight Transportation Service [Member]        
Revenue, before fuel surcharges 133,806 160,213 270,506 321,182
Operating revenues $ 133,806 $ 160,213 270,506 321,182
Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]        
Revenue, before fuel surcharges     $ 270,507 $ 321,182
Revenue, before fuel surcharges, percentage 100.00% 100.00% 100.00% 100.00%
Operating revenues     $ 270,507 $ 321,182
Truckload Services [Member] | Freight Transportation Service [Member]        
Revenue, before fuel surcharges $ 92,824 $ 106,554    
Operating revenues $ 92,824 $ 106,554    
Truckload Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]        
Revenue, before fuel surcharges     $ 185,253 $ 208,754
Revenue, before fuel surcharges, percentage 69.40% 66.50% 68.50% 65.00%
Operating revenues     $ 185,253 $ 208,754
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member]        
Revenue, before fuel surcharges $ 40,982 $ 53,659    
Operating revenues $ 40,982 $ 53,659    
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]        
Revenue, before fuel surcharges     $ 85,254 $ 112,428
Revenue, before fuel surcharges, percentage 30.60% 33.50% 31.50% 35.00%
Operating revenues     $ 85,254 $ 112,428