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Note 3 - Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Accrual Status (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Loans $ 500,491 $ 473,187
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Loans 127,761 132,539
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Loans 128,626 121,813
Commercial Portfolio Segment [Member]    
Loans 78,875 45,449
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Loans 53,136 55,988
Nonperforming Financial Instruments [Member]    
TDR accruing 1,561 1,166
TDR nonaccrual 0 66
Loans 1,561 1,232
TDR related allowance for loan losses 0 0
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
TDR accruing 402 367
TDR nonaccrual 0 66
Loans 402 433
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 626 553
TDR nonaccrual 0 0
Loans 626 553
TDR related allowance for loan losses 0 0
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]    
TDR accruing 186 191
TDR nonaccrual 0 0
Loans 186 191
TDR related allowance for loan losses 0 0
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
TDR accruing 347 55
TDR nonaccrual 0 0
Loans 347 55
TDR related allowance for loan losses $ 0 $ 0