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Note 10 - Revenue and Business Segments - Operating Revenue and Operating Income by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating revenue	$ 249,672	$ 298,023
Operating income	12,250	29,010
Truckload [Member]
Operating revenue	111,551	120,626
Operating income	489	10,041
Truckload [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue	95,022	102,320
Truckload [Member] | Truckload Fuel Surcharge Revenue [Member]
Operating revenue	16,529	18,306
Dedicated [Member]
Operating revenue	86,460	106,449
Operating income	9,258	13,684
Dedicated [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue	71,738	86,831
Dedicated [Member] | Fuel Surcharge Revenue [Member]
Operating revenue	14,722	19,618
Intermodal [Member]
Operating revenue	15,972	28,589
Operating income	(194)	787
Intermodal [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue	13,281	23,401
Intermodal [Member] | Fuel Surcharge Revenue [Member]
Operating revenue	2,691	5,188
Brokerage [Member]
Operating revenue	35,689	42,359
Operating income	$ 2,697	$ 4,498

X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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