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Note 3 - Segment Information - Segment by Operating Fleet Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Total revenue	$ 219,181	$ 173,566
Truckload [Member]
Total revenue	172,660	154,548
Truckload [Member] | Expedited [Member]
Total revenue	62,722	80,762
Truckload [Member] | Dedicated [Member]
Total revenue	79,771	40,379
Truckload [Member] | Refrigerated [Member]
Total revenue	25,605	33,407
Truckload [Member] | Over the Road [Member]
Total revenue	4,562
Managed Freight [Member]
Total revenue	46,521	19,018
Managed Freight [Member] | Brokerage [Member]
Total revenue	24,307	18,093
Managed Freight [Member] | Warehouse [Member]
Total revenue	8,260
Managed Freight [Member] | Transportation Management Services [Member]
Total revenue	8,370
Managed Freight [Member] | Shuttle and Switching [Member]
Total revenue	3,736
Managed Freight [Member] | Factoring [Member]
Total revenue	$ 1,848	$ 925

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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