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Note 5 - Property and Equipment (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Depreciation, Total	$ 60,400	$ 77,600	$ 74,400
Gain (Loss) on Disposition of Property Plant Equipment, Total	7,706	1,650	(298)
Capital Leased Assets, Gross, Total	50,200	55,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	20,800	21,000
Capital Leases, Income Statement, Amortization Expense	$ 4,100	5,500	5,400
Revenue Equipment [Member] | Minimum [Member]
Capital Leases of Lessee, Term of Contract (Month)	48 months
Revenue Equipment [Member] | Maximum [Member]
Capital Leases of Lessee, Term of Contract (Month)	84 months
Net in Depreciation and Amortization Expense [Member]
Gain (Loss) on Disposition of Property Plant Equipment, Total	$ 7,700	$ 1,700	$ (300)

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