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Note 4 - Segment Information - Segment by Operating Fleet Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Total revenue	$ 210,830	$ 220,459	$ 613,333	$ 654,832
Expedited [Member]
Total revenue	78,410	87,674	244,347	265,664
Dedicated [Member]
Total revenue	71,104	87,284	218,833	257,362
Managed Freight [Member]
Total revenue	47,594	33,339	112,695	95,725
Warehousing [Member]
Total revenue	$ 13,722	$ 12,162	$ 37,458	$ 36,081

X

- Definition

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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