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Note 3 - Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Accrual Status (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Recorded investment in loans $ 535,249 $ 490,830
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Recorded investment in loans 143,403 131,152
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Recorded investment in loans 154,266 138,141
Commercial Portfolio Segment [Member]    
Recorded investment in loans 56,245 51,921
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Recorded investment in loans 59,576 55,742
Nonperforming Financial Instruments [Member]    
TDR accruing 760 975
TDR nonaccrual 282 287
Recorded investment in loans 1,042 1,262
TDR related allowance for loan losses 1 7
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
TDR accruing 127 216
TDR nonaccrual 0 0
Recorded investment in loans 127 216
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 477 585
TDR nonaccrual 0 0
Recorded investment in loans 477 585
TDR related allowance for loan losses 0 0
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]    
TDR accruing 156 174
TDR nonaccrual 0 0
Recorded investment in loans 156 174
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 0
TDR nonaccrual 282 287
Recorded investment in loans 282 287
TDR related allowance for loan losses $ 1 $ 7