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Note 15 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Freight revenue	$ 1,216,858	$ 1,046,003
Operating income	120,682	67,162
Operating Segments [Member]
Freight revenue	1,216,858	1,046,003
Operating income	120,682	67,162
Depreciation and amortization	57,512	53,881
Intersegment Eliminations [Member]
Freight revenue	5,505	7,429
Consolidation, Eliminations [Member]
Freight revenue	(5,505)	(7,429)
Highway Services [Member] | Operating Segments [Member]
Freight revenue	452,713	337,063
Operating income	60,552	33,064
Depreciation and amortization	30,101	25,364
Highway Services [Member] | Intersegment Eliminations [Member]
Freight revenue	5,505	7,429
Dedicated [Member]
Freight revenue	362,997	324,541
Dedicated [Member] | Operating Segments [Member]
Freight revenue	362,997	324,541
Operating income	21,087	(1,357)
Depreciation and amortization	25,449	25,960
Dedicated [Member] | Intersegment Eliminations [Member]
Freight revenue	0	0
Managed Freight [Member]
Freight revenue	320,985	321,236
Managed Freight [Member] | Operating Segments [Member]
Freight revenue	320,985	321,236
Operating income	36,858	32,461
Depreciation and amortization	247	595
Managed Freight [Member] | Intersegment Eliminations [Member]
Freight revenue	0	0
Factoring [Member] | Operating Segments [Member]
Freight revenue	80,163	63,163
Operating income	2,185	2,994
Depreciation and amortization	1,715	1,962
Factoring [Member] | Intersegment Eliminations [Member]
Freight revenue	$ 0	$ 0

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