Note 12 - Borrowings - Federal Home Loan Bank Advances (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Amount	$ 66,000,000
Weighted average rate	0.45%
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 2020 [Member]
Amount		$ 65,000,000
Weighted average rate		1.83%
Federal Home Loan Bank Advances Maturing in 2023 [Member]
Amount	$ 6,500,000
Weighted average rate	0.59%
Federal Home Loan Bank Advances Maturing in 2025 [Member]
Amount	$ 6,500,000
Weighted average rate	0.82%
Federal Home Loan Bank Advances Maturing in 2027 [Member]
Amount	$ 3,000,000
Weighted average rate	1.12%