Note 8 - Leases - Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Right-of-use lease asset	$ 2,691		$ 2,691
Weighted Average Remaining Lease Term (Year)	4 years 5 months 23 days		4 years 5 months 23 days
Weighted Average Discount Rate	2.96%		2.96%
Operating lease expense	$ 212	$ 212	$ 641	$ 611
Cash paid for operating leases	234	$ 229	714	$ 661
Other Liabilities [Member]
Lease liability	$ 3,014		$ 3,014