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Note 18 - Regulatory Matters - Compliance With Regulatory Capital Requirements Under Banking Regulations (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jan. 01, 2015
Dec. 31, 2014
Total capital (to risk-weighted assets), actual, amount $ 45,765 $ 37,084    
Total capital (to risk-weighted assets), actual, ratio 0.1069 0.1452    
Total capital (to risk-weighted assets), for capital adequacy, amount $ 34,247 $ 20,438    
Total capital (to risk-weighted assets), for capital adequacy, ratio 0.0800 0.0800    
Total capital (to risk-weighted assets), to be well capitalized, amount $ 42,809 $ 25,548    
Total capital (to risk-weighted assets), to be well capitalized, ratio 0.1000 0.1000    
Tier 1 capital (to risk-weighted assets), actual, amount $ 40,438 $ 33,996    
Tier 1 capital (to risk-weighted assets), actual, ratio 0.0945 0.1331    
Tier 1 capital (to risk-weighted assets), for capital adequacy, amount $ 25,685 $ 15,329    
Tier 1 capital (to risk-weighted assets), for capital adequacy, ratio 0.0600 0.0600 0.060 0.040
Tier 1 capital (to risk-weighted assets), to be well capitalized, amount $ 32,247 $ 20,438    
Tier 1 capital (to risk-weighted assets), to be well capitalized, ratio 0.0800 0.0800    
Common Equity Tier 1 capital (to risk-weighted assets), actual, amount $ 40,438 $ 33,996    
Common Equity Tier 1 capital (to risk-weighted assets), actual, ratio 0.0945 0.1331    
Common Equity Tier 1 capital (to risk-weighted assets), for capital adequacy, amount $ 19,264 $ 11,496    
Common Equity Tier 1 capital (to risk-weighted assets), for capital adequacy, ratio 4.50% 4.50% 4.50%  
Common Equity Tier 1 capital (to risk-weighted assets), to be well capitalized, amount $ 27,826 $ 16,606    
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 $ 40,438 $ 33,996    
Tier 1 capital (to average assets), actual, ratio 0.0741 0.0856    
Tier 1 capital (to average assets), for capital adequacy, amount $ 21,822 $ 15,889    
Tier 1 capital (to average assets), for capital adequacy, ratio 0.0400 0.0400    
Tier 1 capital (to average assets), to be well capitalized, amount $ 27,277 $ 19,861    
Tier 1 capital (to average assets), to be well capitalized, ratio 0.0500 0.0500