Note 8 - Leases - Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Weighted average remaining lease term (years) (Year)	6 years 8 months 12 days	7 years 1 month 6 days
Weighted average discount rate	2.45%	2.45%
Operating lease expense	$ 153	$ 147
Short-term lease expense	29	34
Total lease expense	182	181
Cash paid for amounts included in lease liabilities	153	147
Other Liabilities [Member]
Lease liabilities	553	680
Other Assets [Member]
Right-of-use assets	$ 553	$ 680