Note 6 - Restructuring and Cost Savings Initiatives - Other Restructuring Gains and Charges (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
		Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Gain on sale of Hutchins, TX terminal			$ 7,019	$ 2,137
Total		$ 1,000	(978)
Highway Services and Dedicated [Member] | Gain on Disposition of Property and Equipment, Net [Member]
Gain on sale of Hutchins, TX terminal		(0)	5,712
Abandonment		0	1,048
Highway Services and Dedicated [Member] | Revenue Equipment Rentals and Purchased Transportation [Member]
Abandonment		0	825
Highway Services and Dedicated [Member] | General Supplies and Expenses [Member]
Contract exit costs and restructuring related costs and professional fees		0	695
Highway Services, Dedicated, and Managed Freight [Member] | Salaries Wages And Related Expenses [Member]
Employee separation costs (1)	[1]	1,000	2,791
Dedicated and Managed Freight [Member] | Depreciation and Amortization [Member]
Change in useful life/abandonment of intangible assets		$ 0	$ 1,331

[1] As of September 30, 2020 we have a $1.0 million current liability related to employee separation costs. We expect to incur additional employee separation costs in the fourth quarter of 2020 related to this restructuring activity, but do not have enough information to quantify at this time.