Note 8 - Leases - Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Right-of-use lease asset	$ 2,880		$ 2,880
Weighted Average Remaining Lease Term (Year)	4 years 7 months 24 days		4 years 7 months 24 days
Weighted Average Discount Rate	2.95%		2.95%
Operating lease expense	$ 212	$ 199	$ 429	$ 398
Cash paid for operating leases	234	$ 215	480	$ 432
Other Liabilities [Member]
Lease liability	$ 3,225		$ 3,225