Note 13 - Leases (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating Lease, Weighted Average Discount Rate, Percent	3.10%
Operating Lease, Weighted Average Remaining Lease Term	5 years 4 months 24 days
Operating Lease, Right-of-Use Asset	$ 33,990	$ 0
Operating Lease, Right-of-use Asset, Accumulated Amortization	8,400
Operating Lease, Expense	13,300
Operating Lease, Payments	$ 8,400