Note 3 - Segment Information - Segment by Operating Fleet Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Revenue	$ 213,553	$ 219,181
Highway Services [Member]
Revenue	86,161	88,328
Dedicated [Member]
Revenue	81,788	84,332
Managed Freight [Member]
Revenue	42,865	44,673
Factoring [Member]
Revenue	2,739	1,848
Expedited [Member] \| Highway Services [Member]
Revenue	67,597	61,623
Over the Road [Member] \| Highway Services [Member]
Revenue	18,564	26,705
Brokerage [Member] \| Managed Freight [Member]
Revenue	21,779	24,307
Transportation Management Services [Member] \| Managed Freight [Member]
Revenue	8,958	8,370
Warehouse [Member] \| Managed Freight [Member]
Revenue	$ 12,128	$ 11,996

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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