Note 10 - Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Operating Lease, Weighted Average Discount Rate, Percent	3.13%
Operating Lease, Weighted Average Remaining Lease Term	5 years 357 days
Operating Lease, Right-of-Use Asset	$ 38,591
Operating Lease, Right-of-use Asset, Accumulated Amortization	2,100
Operating Lease, Expense	3,400
Operating Lease, Payments	$ 2,100