Note 9 - Leases - Lease Information and Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Right-of-use asset	$ 1,766		$ 1,766		$ 1,998
Weighted average remaining lease term (in years) (Year)	6 years 2 months 15 days		6 years 2 months 15 days		6 years 9 months 21 days
Weighted average discount rate	3.05%		3.05%		3.04%
Operating lease expense	$ 92	$ 92	$ 279	$ 277
Short-term lease expense	1	1	2	2
Total lease expense	93	93	281	279
Cash paid for amounts included in lease liabilities	91	90	275	272
Right-of-use assets obtained in exchange for operating lease liabilities commencing during the period	0	$ 23	0	$ 23
Other Liabilities [Member]
Lease liability	$ 1,790		$ 1,790		$ 2,016