Note 15 - Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Operating Lease, Right-of-Use Asset	$ 70,472	$ 70,472	$ 0	$ 0
Operating Lease, Liability, Current	16,000	16,000
Operating Lease, Liability, Noncurrent	56,740	56,740	$ 0	$ 0
Operating Lease, Expense	$ 5,000	$ 13,900
Operating Lease, Weighted Average Remaining Lease Term	6 years	6 years
Operating Lease, Weighted Average Discount Rate, Percent	3.99%	3.99%
Maximum [Member]
Lessee, Operating Lease, Term of Contract	29 years	29 years