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Note 4 - Segment Information - Segment by Operating Fleet Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Total revenue	$ 191,689	$ 217,040	$ 402,502	$ 434,373
Highway Services [Member]
Total revenue	79,778	89,663	165,938	177,991
Dedicated [Member]
Total revenue	65,940	85,745	147,728	170,078
Managed Freight [Member]
Total revenue	45,971	41,632	88,836	86,304
Expedited [Member] | Highway Services [Member]
Total revenue	67,907	65,230	135,503	126,852
Over the Road [Member] | Highway Services [Member]
Total revenue	11,871	24,433	30,435	51,139
Brokerage [Member] | Managed Freight [Member]
Total revenue	28,443	20,277	50,222	44,583
Transportation Management Services [Member] | Managed Freight [Member]
Total revenue	5,919	9,431	14,877	17,801
Warehouse [Member] | Managed Freight [Member]
Total revenue	$ 11,609	$ 11,924	$ 23,737	$ 23,920

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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