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Note 13 - Regulatory Matters - Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2015
Total Risk-Based Capital $ 48,411 $ 45,968  
Total Risk-Based Capital (to risk-weighted assets) 22.21% 21.081%  
Total Risk-Based Capital for Capital Adequacy $ 17,438 $ 17,445  
Total Risk-Based Capital for Capital Adequacy (to risk-weighted assets) 8.00% 8.00%  
Total Risk-Based Capital for Capital Adequacy with Capital Buffer $ 21,906 $ 21,533  
Total Risk-Based Capital for Capital Adequacy with Capital Buffer (to risk-weighted assets) 10.50% 9.875%  
Total Risk-Based Capital to be Well Capitalized $ 21,797 $ 21,806  
Total Risk-Based Capital to be Well Capitalized (to risk-weighted assets) 10.00% 10.00%  
Tier I Capital $ 45,684 $ 43,340  
Tier I Capital (to risk-weighted assets) 20.959% 19.875%  
Tier I Capital for Capital Adequacy $ 13,078 $ 13,083  
Tier I Capital for Capital Adequacy (to risk-weighted assets) 6.00% 6.00% 4.00%
Tier I Capital for Capital Adequacy with Capital Buffer $ 18,527 $ 17,172  
Tier I Capital for Capital Adequacy with Capital Buffer (to risk-weighted assets) 8.50% 7.875%  
Tier I Capital to be Well Capitalized $ 17,438 $ 17,445  
Tier I Capital to be Well Capitalized (to risk-weighted assets) 8.00% 8.00%  
Common Equity Tier I $ 45,684 $ 43,340  
Common Equity Tier I (to risk-weighted assets) 20.959% 19.875%  
Common Equity Tier I for Capital Adequacy $ 9,809 $ 9,813  
Common Equity Tier I for Capital Adequacy (to risk-weighted assets) 4.50% 4.50%  
Common Equity Tier I for Capital Adequacy with Capital Buffer $ 15,258 $ 13,901  
Common Equity Tier I for Capital Adequacy with Capital Buffer (to risk-weighted assets) 7.00% 6.375%  
Common Equity Tier I to be Well Capitalized $ 14,168 $ 14,174  
Common Equity Tier I to be Well Capitalized (to risk-weighted assets) 6.50% 6.50%  
Tier I Leverage $ 45,684 $ 43,340  
Tier I Leverage (to adjusted total assets) 14.997% 15.158%  
Tier I Leverage for Capital Adequacy $ 12,185 $ 11,437  
Tier I Leverage for Capital Adequacy (to adjusted total assets) 4.00% 4.00%  
Tier I Leverage for Capital Adequacy with Capital Buffer $ 12,185 $ 11,437  
Tier I Leverage for Capital Adequacy with Capital Buffer (to adjusted total assets) 4.00% 4.00%  
Tier I Leverage to be Well Capitalized $ 15,231 $ 14,296  
Tier I Leverage to be Well Capitalized (to adjusted total assets) 5.00% 5.00%