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Note 1 - Summary of Significant Accounting Policies - Revenue by Operating Segment (Details) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2019	[1]	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	[1]	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue	$ 233,135		$ 222,914	$ 219,298	$ 219,181	$ 272,268		$ 243,303	$ 196,318	$ 173,566	$ 894,528	$ 885,455	$ 705,007
Highway Services [Member]
Revenue											356,521	469,308	467,992
Highway Services [Member] | Expedited [Member]
Revenue											262,764	317,244	314,579
Highway Services [Member] | Over the Road [Member]
Revenue											93,757	152,064	153,413
Dedicated [Member]
Revenue											342,473	257,739	144,845
Managed Freight [Member]
Revenue											186,394	153,346	89,042
Managed Freight [Member] | Brokerage [Member]
Revenue											102,479	102,730	79,630
Managed Freight [Member] | Transportation Management Services [Member]
Revenue											36,136	27,036	9,412
Managed Freight [Member] | Warehouse [Member]
Revenue											47,779	23,580
Factoring [Member]
Revenue											$ 9,140	$ 5,062	$ 3,128
[1] Includes $40.1 million one-time benefit related to the Tax Act.

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- 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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