Note 11 - Segment Information (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

Reconciliation of Revenue from Segments to Consolidated [Table Text Block]

	Three Months Ended					Six Months Ended
	June 30,					June 30,
	2018		2017			2018		2017
Revenues
Truckload	$	391,397	$	332,982		$	762,564	$	658,876
Brokerage		58,361		37,368			112,902		75,150
Total Operating Revenue	$	449,758	$	370,350		$	875,466	$	734,026
Operating Income
Truckload	$	18,590	$	3,295		$	31,093	$	4,997
Brokerage		1,428		(606	)		3,779		(380	)
Total Operating Income	$	20,018	$	2,689		$	34,872	$	4,617

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Revenues
United States	$	436,227	$	357,721	$	849,078	$	708,893
Foreign countries
Mexico		13,531		12,629		26,388		25,133
Total	$	449,758	$	370,350	$	875,466	$	734,026

	As of		As of
	June 30,		December 31,
	2018		2017
Long-lived Assets
United States	$	450,252	$	459,021
Foreign countries
Mexico		5,404		4,884
Total	$	455,656	$	463,905