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Note 15 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Freight revenue	$ 1,046,003	$ 838,561
Operating income (loss)	67,162	(14,027)
Operating Segments [Member]
Freight revenue	1,046,003	838,561
Operating income (loss)	67,162	(14,027)
Depreciation and amortization	53,881	65,472
Intersegment Eliminations [Member]
Freight revenue	7,429	11,630
Consolidation, Eliminations [Member]
Freight revenue	(7,429)	(11,630)
Highway Services [Member] | Operating Segments [Member]
Freight revenue	337,063	320,202
Operating income (loss)	33,064	(7,038)
Depreciation and amortization	25,364	31,969
Highway Services [Member] | Intersegment Eliminations [Member]
Freight revenue	7,429	11,630
Dedicated [Member]
Freight revenue	324,541	288,652
Dedicated [Member] | Operating Segments [Member]
Freight revenue	324,541	288,652
Operating income (loss)	(1,357)	(15,534)
Depreciation and amortization	25,960	29,610
Dedicated [Member] | Intersegment Eliminations [Member]
Freight revenue	0	0
Managed Freight [Member]
Freight revenue	321,236	177,579
Managed Freight [Member] | Operating Segments [Member]
Freight revenue	321,236	177,579
Operating income (loss)	32,461	4,482
Depreciation and amortization	595	829
Managed Freight [Member] | Intersegment Eliminations [Member]
Freight revenue	0	0
Factoring [Member] | Operating Segments [Member]
Freight revenue	63,163	52,128
Operating income (loss)	2,994	4,063
Depreciation and amortization	1,962	3,064
Factoring [Member] | Intersegment Eliminations [Member]
Freight revenue	$ 0	$ 0

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