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Note 6 - Loans - Non-accrual Loans (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Nonaccrual loans $ 4,628,796
Commercial Real Estate Portfolio Segment [Member]    
Nonaccrual loans 4,407,829
Residential Portfolio Segment [Member]    
Nonaccrual loans $ 220,967