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Note 10 - 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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating revenues	$ 123,497	$ 128,994	$ 133,000	$ 128,686	$ 138,176	$ 140,325	$ 135,302	$ 119,458	$ 514,177	$ 533,261	$ 437,838
Motor Carrier [Member]
Operating revenues									$ 514,177	$ 533,261	$ 437,838
Motor Carrier [Member] | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]
Operating Revenues, percentage									100.00%	100.00%	100.00%
Motor Carrier [Member] | UNITED STATES
Operating revenues									$ 326,559	$ 302,754	$ 255,197
Motor Carrier [Member] | UNITED STATES | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]
Operating Revenues, percentage									63.50%	56.80%	58.30%
Motor Carrier [Member] | MEXICO
Operating revenues									$ 186,391	$ 229,350	$ 181,099
Motor Carrier [Member] | MEXICO | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]
Operating Revenues, percentage									36.30%	43.00%	41.40%
Motor Carrier [Member] | CANADA
Operating revenues									$ 1,226	$ 1,157	$ 1,542
Motor Carrier [Member] | CANADA | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]
Operating Revenues, percentage									0.20%	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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