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Note 18 - Regulatory Matters - Compliance With Regulatory Capital Requirements Under Banking Regulations (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2014
Total capital (to risk-weighted assets), actual, amount $ 33,087 $ 29,778  
Total capital (to risk-weighted assets), actual, ratio 14.41% 15.49%  
Total capital (to risk-weighted assets), for capital adequacy, amount $ 18,373 $ 15,378  
Total capital (to risk-weighted assets), for capital adequacy, ratio 8.00% 8.00%  
Total capital (to risk-weighted assets), to be well capitalized, amount $ 22,966 $ 19,233  
Total capital (to risk-weighted assets), to be well capitalized, ratio 10.00% 10.00%  
Tier 1 capital (to risk-weighted assets), actual, amount $ 30,829 $ 27,786  
Tier 1 capital (to risk-weighted assets), actual, ratio 13.42% 14.45%  
Tier 1 capital (to risk-weighted assets), for capital adequacy, amount $ 13,780 $ 11,534  
Tier 1 capital (to risk-weighted assets), for capital adequacy, ratio 6.00% 6.00% 4.00%
Tier 1 capital (to risk-weighted assets), to be well capitalized, amount $ 18,373 $ 15,378  
Tier 1 capital (to risk-weighted assets), to be well capitalized, ratio 8.00% 8.00%  
Common Equity Tier 1 capital (to risk-weighted assets), actual, amount $ 30,829 $ 27,786  
Common Equity Tier 1 capital (to risk-weighted assets), actual, ratio 13.42% 14.45%  
Common Equity Tier 1 capital (to risk-weighted assets), for capital adequacy, amount $ 10,335 $ 8,650  
Common Equity Tier 1 capital (to risk-weighted assets), for capital adequacy, ratio 4.50% 4.50%  
Common Equity Tier 1 capital (to risk-weighted assets), to be well capitalized, amount $ 14,928 $ 12,495  
Common Equity Tier 1 capital (to risk-weighted assets), to be well capitalized, ratio 6.50% 6.50%  
Tier 1 capital (to average assets), actual, amount $ 30,829 $ 27,786  
Tier 1 capital (to average assets), actual, ratio 10.35% 10.92%  
Tier 1 capital (to average assets), for capital adequacy, amount $ 11,915 $ 10,175  
Tier 1 capital (to average assets), for capital adequacy, ratio 4.00% 4.00%  
Tier 1 capital (to average assets), to be well capitalized, amount $ 14,894 $ 12,718  
Tier 1 capital (to average assets), to be well capitalized, ratio 5.00% 5.00%