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Note 15 - Regulatory Capital (Tables)
 12 Months Ended
Dec. 31, 2023
Notes Tables  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
                                                   

To be Well Capitalized

  
                                                   

Under Prompt

  
                   

For Capital

    

For Capital Adequacy

    

Corrective

  
   

Actual

    

Adequacy Purposes

    

with Capital Buffer

    

Action Provisions

  

Bank Only

  

Amount

    

Ratio

    

Amount

    

Ratio

    

Amount

    

Ratio

    

Amount

    

Ratio

  

At December 31, 2023

                                                                

Total risk-based capital (to risk-weighted assets)

   $ 339,436       13.37 %   $ 203,094       8.00 %   $ 266,561       10.50 %   $ 253,868       10.00 %

Tier 1 risk-based capital (to risk-weighted assets)

   $ 307,686       12.12 %   $ 152,321       6.00 %   $ 215,787       8.50 %   $ 203,094       8.00 %

Tier 1 leverage capital (to average assets)

   $ 307,686       10.39 %   $ 118,488       4.00 %   $ N/A       N/A     $ 148,109       5.00 %

CET 1 capital (to risk-weighted assets)

   $ 307,686       12.12 %   $ 114,240       4.50 %   $ 177,707       7.00 %   $ 165,014       6.50 %