Note 8 - Leases - Lease Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Weighted average remaining lease term (in years) (Year)	6 years 11 months 1 day	7 years 3 months 29 days
Weighted average discount rate	3.09%	3.03%
Operating lease cost	$ 1,069	$ 993	$ 1,040
Short-term lease cost	0	3	3
Total lease cost	1,069	996	1,043
Cash paid for amounts included in the measurement of lease liabilities	1,047	959	$ 1,013
Other Liabilities [Member]
Lease liabilities	4,023	4,940
Other Assets [Member]
Right-of-use assets	$ 3,939	$ 4,878