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Note 4 - Loans and Allowance for Loan Losses - Nonaccruing Loans (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Nonaccruing loans $ 17,779,748 $ 18,628,598
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]    
Nonaccruing loans 2,620,669 3,086,159
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]    
Nonaccruing loans 0 0
Real Estate, Construction [Member]    
Nonaccruing loans 5,948,672 6,239,326
Commercial Real Estate Portfolio Segment [Member]    
Nonaccruing loans 3,849,156 3,932,241
Commercial Portfolio Segment [Member]    
Nonaccruing loans 5,236,161 5,249,782
Consumer and Other Loans [Member]    
Nonaccruing loans $ 125,090 $ 121,090