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Note F - Segment Information - Segment Revenue Reconciliation (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Revenue, before fuel surcharges $ 182,948,000 $ 207,412,000 $ 365,540,000 $ 429,136,000
Freight Transportation Service [Member]        
Revenue, before fuel surcharges $ 160,213,000 $ 182,082,000 321,182,000 375,536,000
Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]        
Revenue, before fuel surcharges     $ 321,182 $ 375,536
Revenue, before fuel surcharges, percentage 100.00% 100.00% 100.00% 100.00%
Truckload Services [Member] | Freight Transportation Service [Member]        
Revenue, before fuel surcharges $ 106,554,000 $ 120,226,000    
Truckload Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]        
Revenue, before fuel surcharges     $ 208,754 $ 245,424
Revenue, before fuel surcharges, percentage 66.50% 66.00% 65.00% 65.40%
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member]        
Revenue, before fuel surcharges $ 53,659,000 $ 61,856,000    
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]        
Revenue, before fuel surcharges     $ 112,428 $ 130,112
Revenue, before fuel surcharges, percentage 33.50% 34.00% 35.00% 34.60%