Note 7 - Leases - Lease Expense (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Right-of-use assets	$ 588		$ 680
Weighted average remaining lease term (years) (Year)	6 years 9 months 3 days		7 years 1 month 6 days
Weighted average discount rate	2.44%		2.45%
Operating lease expense	$ 115	$ 108
Short-term lease expense	22	25
Total lease expense	137	133
Cash paid for amounts included in lease liabilities	115	$ 108
Other Liabilities [Member]
Lease liabilities	$ 588		$ 680