Note 10 - Borrowings - Federal Home Loan Bank Advances (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Amount	$ 16,000,000	$ 66,000,000
Weighted average rate	0.78%	0.45%
Federal Home Loan Bank Advances Maturing in 2023 [Member]
Amount	$ 6,500,000	$ 6,500,000
Weighted average rate	0.59%	0.59%
Federal Home Loan Bank Advances Maturing in 2021 [Member]
Amount		$ 50,000,000
Weighted average rate		0.35%
Federal Home Loan Bank Advances Maturing in 2025 [Member]
Amount	$ 6,500,000	$ 6,500,000
Weighted average rate	0.82%	0.82%
Federal Home Loan Bank Advances Maturing in 2027 [Member]
Amount	$ 3,000,000	$ 3,000,000
Weighted average rate	1.12%	1.12%