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Note 4 - Property and Equipment (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Depreciation, Total	$ 77.6	$ 74.4	$ 71.4
Capital Leased Assets, Gross, Total	55.0	55.4
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	21.0	15.6
Capital Leases, Income Statement, Amortization Expense	$ 5.5	5.4	2.6
Revenue Equipment [Member] | Minimum [Member]
Capital Leases of Lessee, Term of Contract	4 years
Revenue Equipment [Member] | Maximum [Member]
Capital Leases of Lessee, Term of Contract	7 years
Net in Depreciation and Amortization Expense [Member]
Gain (Loss) on Disposition of Property Plant Equipment, Total	$ 1.7	$ (0.3)	$ (4.0)

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