Note 8 - Leases - Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Right-of-use lease asset	$ 3,569		$ 3,569
Lease liability	$ 3,994		$ 3,994
Weighted Average Remaining Lease Term (Year)	6 years 18 days		6 years 18 days
Weighted Average Discount Rate	3.00%		3.00%
Operating lease expense	$ 199	$ 189	$ 398	$ 379
Cash paid for operating leases	$ 215	$ 213	$ 432	$ 419