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Note 11 - Segment Information, Significant Customers, Industry Concentration, and Geographic Areas - Revenue Dollars and Percentages by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating revenues	$ 138,176	$ 140,325	$ 135,302	$ 119,458	$ 110,888	$ 108,899	$ 108,646	$ 109,405	$ 533,261	$ 437,838	$ 432,852
Motor Carrier [Member]
Operating revenues									$ 533,261	$ 437,838	$ 432,852
Motor Carrier [Member] | Sales Revenue, Net [Member] | Geographic Concentration Risk [Member]
Operating Revenues, percentage									100.00%	100.00%	100.00%
Motor Carrier [Member] | UNITED STATES
Operating revenues									$ 302,754	$ 255,197	$ 251,390
Motor Carrier [Member] | UNITED STATES | Sales Revenue, Net [Member] | Geographic Concentration Risk [Member]
Operating Revenues, percentage									56.80%	58.30%	58.10%
Motor Carrier [Member] | MEXICO
Operating revenues									$ 229,350	$ 181,099	$ 181,159
Motor Carrier [Member] | MEXICO | Sales Revenue, Net [Member] | Geographic Concentration Risk [Member]
Operating Revenues, percentage									43.00%	41.40%	41.90%
Motor Carrier [Member] | CANADA
Operating revenues									$ 1,157	$ 1,542	$ 303
Motor Carrier [Member] | CANADA | Sales Revenue, Net [Member] | Geographic Concentration Risk [Member]
Operating Revenues, percentage									0.20%	0.30%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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