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Note 4 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Carrying balance of TDR $ 6,141,262 $ 5,636,365
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]    
Carrying balance of TDR 1,178,876 1,163,782
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]    
Carrying balance of TDR 0 0
Real Estate, Construction [Member]    
Carrying balance of TDR 3,700,084 3,738,409
Commercial Real Estate Portfolio Segment [Member]    
Carrying balance of TDR 893,992 161,491
Commercial Portfolio Segment [Member]    
Carrying balance of TDR $ 368,310 $ 572,683