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Note 3 - Revenue and Business Segments - Operating Revenue and Operating Income by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating revenue	$ 199,649	$ 170,679	$ 583,633	$ 515,349
Operating Income	18,993	13,022	50,810	42,529
Truckload [Member]
Operating revenue	93,920	92,008	281,341	282,580
Operating Income	10,026	5,764	25,530	19,249
Truckload [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue	80,563	81,836	241,304	251,127
Truckload [Member] | Fuel Surcharge Revenue [Member]
Operating revenue	13,357	10,172	40,037	31,453
Dedicated [Member]
Operating revenue	58,791	42,149	164,595	123,928
Operating Income	5,249	4,514	13,321	14,075
Dedicated [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue	48,500	39,154	138,096	114,654
Dedicated [Member] | Fuel Surcharge Revenue [Member]
Operating revenue	10,291	2,995	26,499	9,274
Intermodal [Member]
Operating revenue	25,939	19,895	76,061	58,196
Operating Income	2,507	1,588	7,997	5,777
Intermodal [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue	21,735	17,423	63,834	51,111
Intermodal [Member] | Fuel Surcharge Revenue [Member]
Operating revenue	4,204	2,472	12,227	7,085
Brokerage [Member]
Operating revenue	20,999	16,627	61,636	50,645
Operating Income	$ 1,211	$ 1,156	$ 3,962	$ 3,428

X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

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