Note 6 - Leases - Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Weighted average remaining lease term (years) (Year)	6 years 8 months 26 days		6 years 8 months 26 days		6 years 10 months 24 days
Weighted average discount rate	3.12%		3.12%		3.09%
Operating lease cost	$ 268	$ 267	$ 803	$ 804
Short-term lease cost	0	0	0	0
Total lease cost	268	267	803	804
Cash paid for amounts included in the measurement of lease liabilities	271	$ 265	810	$ 781
Other Liabilities [Member]
Lease liabilities	3,575		3,575		$ 4,023
Other Assets [Member]
Right-of-use assets	$ 3,497		$ 3,497		$ 3,939