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Note 5 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue	$ 266,851	$ 291,585
Operating income	17,632	23,847
Operating Segments [Member]
Revenue	266,851	291,585
Operating income	17,632	23,847
Intersegment Eliminations [Member]
Revenue	4,462	2,494
Consolidation, Eliminations [Member]
Revenue	(4,462)	(2,494)
Highway Services [Member] | Operating Segments [Member]
Revenue	100,896	98,797
Operating income	9,276	9,331
Highway Services [Member] | Intersegment Eliminations [Member]
Revenue	4,462	2,494
Dedicated [Member] | Operating Segments [Member]
Revenue	80,244	88,947
Operating income	7,147	2,641
Dedicated [Member] | Intersegment Eliminations [Member]
Revenue	0	0
Managed Freight [Member] | Operating Segments [Member]
Revenue	60,874	86,151
Operating income	1,218	10,831
Managed Freight [Member] | Intersegment Eliminations [Member]
Revenue	0	0
Factoring [Member] | Operating Segments [Member]
Revenue	24,837	17,690
Operating income	(9)	1,044
Factoring [Member] | Intersegment Eliminations [Member]
Revenue	$ 0	$ 0

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