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Note 10 - Segment Information, Significant Customers, Industry Concentration, and Geographic Areas Dividends - Revenue Dollars and Percentages by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating revenues	$ 142,750	$ 121,942	$ 92,979	$ 129,155	$ 123,497	$ 128,994	$ 133,000	$ 128,686	$ 486,825	$ 514,177	$ 533,261
Motor Carrier [Member]
Operating revenues									$ 479,110	$ 514,177	$ 533,261
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									$ 316,542	$ 326,559	$ 302,754
Motor Carrier [Member] | UNITED STATES | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]
Operating Revenues, percentage									66.10%	63.50%	56.80%
Motor Carrier [Member] | MEXICO
Operating revenues									$ 161,412	$ 186,392	$ 229,350
Motor Carrier [Member] | MEXICO | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]
Operating Revenues, percentage									33.70%	36.30%	43.00%
Motor Carrier [Member] | CANADA
Operating revenues									$ 1,156	$ 1,226	$ 1,157
Motor Carrier [Member] | CANADA | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]
Operating Revenues, percentage									0.20%	0.20%	0.20%

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