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Note 3 - Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Accrual Status (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Recorded investment in loans $ 493,597 $ 508,879
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Recorded investment in loans 132,774 131,850
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Recorded investment in loans 133,721 135,484
Commercial Portfolio Segment [Member]    
Recorded investment in loans 60,131 81,809
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Recorded investment in loans 53,736 53,277
Nonperforming Financial Instruments [Member]    
TDR accruing 1,302 1,732
TDR nonaccrual 287 0
Recorded investment in loans 1,589 1,732
TDR related allowance for loan losses 7 0
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
TDR accruing 526 556
TDR nonaccrual 0 0
Recorded investment in loans 526 556
TDR related allowance for loan losses 0 0
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
TDR accruing 595 621
TDR nonaccrual 0 0
Recorded investment in loans 595 621
TDR related allowance for loan losses 0 0
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]    
TDR accruing 181 210
TDR nonaccrual 0 0
Recorded investment in loans 181 210
TDR related allowance for loan losses 0 0
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
TDR accruing 0 345
TDR nonaccrual 287 0
Recorded investment in loans 287 345
TDR related allowance for loan losses $ 7 $ 0