Note 9 - Leases - Lease Information and Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Right-of-use asset	$ 1,921		$ 1,998
Weighted average remaining lease term (in years) (Year)	6 years 7 months 6 days		6 years 9 months 21 days
Weighted average discount rate	3.05%		3.04%
Operating lease expense	$ 93	$ 93
Short-term lease expense	1	1
Total lease expense	94	94
Cash paid for amounts included in lease liabilities	92	91
Right-of-use assets obtained in exchange for operating lease liabilities commencing during the period	0	$ 0
Other Liabilities [Member]
Lease liability	$ 1,941		$ 2,016