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Note 10 - Revenue and Business Segments - Operating Revenue and Operating Income by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Operating revenue	$ 237,366	$ 279,538	$ 733,276	$ 863,233
Operating income	4,269	17,230	26,493	74,453
Truckload [Member]
Operating revenue	108,424	114,227	332,498	351,991
Operating income	(142)	2,738	1,462	22,348
Truckload [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue	93,278	96,516	284,346	300,104
Truckload [Member] | Truckload Fuel Surcharge Revenue [Member]
Operating revenue	15,146	17,711	48,152	51,887
Dedicated [Member]
Operating revenue	75,021	101,797	242,747	313,231
Operating income	3,056	11,286	18,964	39,143
Dedicated [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue	62,898	82,963	202,080	257,231
Dedicated [Member] | Fuel Surcharge Revenue [Member]
Operating revenue	12,123	18,834	40,667	56,000
Intermodal [Member]
Operating revenue	14,509	22,047	45,545	73,001
Operating income	(1,542)	(1,074)	(2,420)	(452)
Intermodal [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue	12,289	18,122	38,230	60,277
Intermodal [Member] | Fuel Surcharge Revenue [Member]
Operating revenue	2,220	3,925	7,315	12,724
Brokerage [Member]
Operating revenue	39,412	41,467	112,486	125,010
Operating income	$ 2,897	$ 4,280	$ 8,487	$ 13,414

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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