Note 7 - Regulatory Matters - Actual and Required Capital (Details) $ in Thousands	Jun. 30, 2020 USD ($) Rate	Dec. 31, 2019 USD ($) Rate
Total Capital (to Risk-Weighted Assets), Actual Amount	$ 45,040	$ 42,944
Total Capital (to Risk-Weighted Assets), Actual Ratio	0.1257	0.1459
Total Capital (to Risk-Weighted Assets), for Capital Adequacy Purposes, Actual Amount	$ 28,658	$ 23,554
Total Capital (to Risk-Weighted Assets), for Capital Adequacy Purposes, Actual Ratio	0.08
Total Capital (to Risk-Weighted Assets), to be Well Capitalized, Actual Amount	$ 35,823	$ 29,443
Total Capital (to Risk-Weighted Assets), to be Well Capitalized, Actual Ratio	0.1	0.1
Tier I Capital (to Risk-Weighted Assets), Actual Amount	$ 41,024	$ 39,982
Tier I Capital (to Risk-Weighted Assets), Actual Ratio	0.1145	0.1358
Tier I Capital (to Risk-Weighted Assets), for Capital Adequacy Purposes, Actual Amount	$ 21,494	$ 17,666
Tier I Capital (to Risk-Weighted Assets), for Capital Adequacy Purposes, Actual Ratio	0.06
Tier I Capital (to Risk-Weighted Assets), to be Well Capitalized, Actual Amount	$ 28,659	$ 23,554
Tier I Capital (to Risk-Weighted Assets), to be Well Capitalized, Actual Ratio	0.08	0.08
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	$ 41,024	$ 39,982
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio	0.1145	0.1358
Common Equity Tier 1 Capital (to Risk-Weighted Assets), for Capital Adequacy Purposes, Actual Amount	$ 16,120	$ 13,249
Common Equity Tier 1 Capital (to Risk-Weighted Assets), for Capital Adequacy Purposes, Actual Ratio (Rate) | Rate	4.50%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), to be Well Capitalized, Actual Amount	$ 23,285	$ 19,138
Common Equity Tier 1 Capital (to Risk-Weighted Assets), to be Well Capitalized, Actual Ratio (Rate) | Rate	6.50%	6.50%
Tier I Capital (to Average Assets), Actual Amount	$ 41,024	$ 39,982
Tier I Capital (to Average Assets), Actual Ratio	0.093	0.103
Tier I Capital (to Average Assets), for Capital Adequacy Purposes, Actual Amount	$ 17,646	$ 15,529
Tier I Capital (to Average Assets), for Capital Adequacy Purposes, Actual Ratio	0.04
Tier I Capital (to Average Assets), to be Well Capitalized, Actual Amount	$ 22,058	$ 19,411
Tier I Capital (to Average Assets), to be Well Capitalized, Actual Ratio	0.05	0.05