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Note F - Segment Information - Revenue Dollars and Percentages by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Operating revenues $ 151,134 $ 182,948 $ 306,475 $ 365,540
Motor Carrier [Member]        
Operating revenues $ 151,134 $ 182,948 $ 306,476 $ 365,540
Motor Carrier [Member] | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]        
Revenue, before fuel surcharges, percentage 100.00% 100.00% 100.00% 100.00%
Motor Carrier [Member] | UNITED STATES        
Operating revenues $ 84,304 $ 117,817 $ 168,149 $ 236,719
Motor Carrier [Member] | UNITED STATES | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]        
Revenue, before fuel surcharges, percentage 55.80% 64.40% 54.90% 64.70%
Motor Carrier [Member] | MEXICO        
Operating revenues $ 66,537 $ 64,821 $ 137,634 $ 128,209
Motor Carrier [Member] | MEXICO | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]        
Revenue, before fuel surcharges, percentage 44.00% 35.40% 44.90% 35.10%
Motor Carrier [Member] | CANADA        
Operating revenues $ 293 $ 310 $ 693 $ 612
Motor Carrier [Member] | CANADA | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]        
Revenue, before fuel surcharges, percentage 0.20% 0.20% 0.20% 0.20%