Note 7 - Leases (Details Textual) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Lease, Liability, Total	$ 70.5
Lessee, Operating Lease, Renewal Term (Year)	5 years
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Disposal Group, Including Discontinued Operation, Operating Lease, Right-of-Use Asset 1	$ 8.7	$ 11.5
Disposal Group, Including Discontinued Operation, Accrued Expense	2.3	1.8
Disposal Group, Including Discontinued Operation, Other Liabilities	$ 7.3	$ 10.4
Minimum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	1 year
Maximum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	20 years