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Note 12 - Business Segments - Operating Revenue and Operating Income by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating revenue	$ 170,679	$ 170,464	$ 515,349	$ 498,483
Operating Income	13,022	14,869	42,529	43,770
Truckload [Member]
Operating revenue	92,008	95,195	282,580	279,285
Operating Income	5,764	6,509	19,249	20,400
Truckload [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue	81,836	85,469	251,127	253,514
Truckload [Member] | Fuel Surcharge Revenue [Member]
Operating revenue	10,172	9,726	31,453	25,771
Dedicated [Member]
Operating revenue	42,149	40,636	123,928	117,008
Operating Income	4,514	5,505	14,075	14,963
Dedicated [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue	39,154	37,669	114,654	109,833
Dedicated [Member] | Fuel Surcharge Revenue [Member]
Operating revenue	2,995	2,967	9,274	7,175
Intermodal [Member]
Operating revenue	19,895	18,360	58,196	53,343
Operating Income	1,588	1,645	5,777	5,396
Intermodal [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue	17,423	16,381	51,111	48,353
Intermodal [Member] | Fuel Surcharge Revenue [Member]
Operating revenue	2,472	1,979	7,085	4,990
Brokerage [Member]
Operating revenue	16,627	16,273	50,645	48,847
Operating Income	$ 1,156	$ 1,210	$ 3,428	$ 3,011

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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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