Note 9 - FHLB Advances - Contractual Maturities and Average Effective Rates of Outstanding Advances (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Advances from Federal Home Loan Banks, Total	$ 56,536	$ 79,953
Federal Home Loan Bank Advances Outstanding [Member]
Advance, 2020	$ 33,455
Fixed rate, 2020	0.47%
Advance, 2020	$ 2,215	$ 50,004
Fixed rate, 2020		1.99%
Fixed rate, 2021	2.60%	2.52%
Advance, 2021	$ 0	$ 2,400
Fixed rate, 2022	0.00%	0.00%
Advance, 2022	$ 297	$ 0
Fixed rate, 2023	1.00%	1.00%
Advance, 2023	$ 1,434	$ 456
Fixed rate, 2024	2.36%	2.36%
Advance, 2024	$ 2,941	$ 2,023
Fixed rate, 2025	2.43%	2.41%
Advance, 2025	$ 5,544	$ 3,774
Fixed rate, 2026	1.95%	1.96%
Advance, 2026	$ 5,989	$ 8,156
Fixed rate, 2027	1.75%	1.73%
Advance, 2027	$ 4,661	$ 7,445
Fixed rate, 2028	2.32%	2.32%
Advance, 2028		$ 5,695
Advances from Federal Home Loan Banks, Total	$ 56,536	$ 79,953
Fixed rate	1.14%	2.02%