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Note 3 - Segment Information - Segment by Operating Fleet Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue	$ 219,298	$ 196,318	$ 438,479	$ 369,884
Truckload [Member]
Revenue	175,408	170,711	348,069	325,259
Truckload [Member] | Expedited [Member]
Revenue	66,529	85,589	129,251	166,351
Truckload [Member] | Dedicated [Member]
Revenue	80,973	35,028	160,745	68,435
Truckload [Member] | Refrigerated [Member]
Revenue	23,134		48,739
Truckload [Member] | Over the Road [Member]
Revenue	4,772	50,094	9,334	90,473
Managed Freight [Member]
Revenue	43,890	25,607	90,410	44,625
Managed Freight [Member] | Brokerage [Member]
Revenue	20,277	24,489	44,583	42,582
Managed Freight [Member] | Transportation Management Services [Member]
Revenue	9,431		17,801
Managed Freight [Member] | Shuttle and Switching [Member]
Revenue	3,562		7,298
Managed Freight [Member] | Warehouse [Member]
Revenue	8,362		16,622
Managed Freight [Member] | Factoring [Member]
Revenue	$ 2,258	$ 1,118	$ 4,106	$ 2,043

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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