Note 8 - Leases - Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Right-of-use lease asset	$ 3,738
Lease liability	$ 4,180
Weighted Average Remaining Lease Term (in years) (Year)	6 years 87 days
Weighted Average Discount Rate	3.00%
Operating lease expense	$ 199	$ 189
Cash paid for operating leases	$ 215	$ 207