Note 9 - FHLB Advances - Contractual Maturities and Average Effective Rates of Outstanding Advances (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Advances from Federal Home Loan Banks, Total	$ 69,191	$ 79,953
Federal Home Loan Bank Advances Outstanding [Member]
Advance, 2020	$ 44,584
Fixed rate, 2020	1.37%
Advance, 2020		$ 50,004
Fixed rate, 2020		1.99%
Advance, 2021	$ 2,369	$ 2,400
Fixed rate, 2021	2.52%	2.52%
Advance, 2022	$ 0	$ 0
Fixed rate, 2022	0.00%	0.00%
Advance, 2023	$ 391	$ 456
Fixed rate, 2023	1.01%	1.00%
Advance, 2024	$ 1,529	$ 2,023
Fixed rate, 2024	2.36%	2.36%
Advance, 2025	$ 3,173	$ 3,774
Fixed rate, 2025	2.43%	2.41%
Advance, 2026	$ 5,719	$ 8,156
Fixed rate, 2026	1.95%	1.96%
Advance, 2027	$ 6,535	$ 7,445
Fixed rate, 2027	1.75%	1.73%
Advance, 2028	$ 4,891	$ 5,695
Fixed rate, 2028	2.33%	2.32%
Advances from Federal Home Loan Banks, Total	$ 69,191	$ 79,953
Fixed rate	1.63%	2.02%