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Note F - Segment Information - Revenue Dollars and Percentages by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Operating revenues	$ 150,264	$ 182,577	$ 456,740	$ 548,116
Motor Carrier [Member]
Operating revenues	$ 150,264	$ 182,577	$ 456,740	$ 548,116
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	$ 82,919	$ 111,031	$ 250,925	$ 347,748
Motor Carrier [Member] | UNITED STATES | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]
Revenue, before fuel surcharges, percentage	55.20%	60.80%	54.90%	63.40%
Motor Carrier [Member] | MEXICO
Operating revenues	$ 67,062	$ 71,287	$ 204,838	$ 199,496
Motor Carrier [Member] | MEXICO | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]
Revenue, before fuel surcharges, percentage	44.60%	39.00%	44.90%	36.40%
Motor Carrier [Member] | CANADA
Operating revenues	$ 283	$ 259	$ 977	$ 872
Motor Carrier [Member] | CANADA | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]
Revenue, before fuel surcharges, percentage	0.20%	0.20%	0.20%	0.20%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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