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Note 3 - Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Accrual Status (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Recorded investment in loans $ 434,100 $ 414,617
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Recorded investment in loans 138,890 136,960
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Recorded investment in loans 106,508 100,340
Commercial Portfolio Segment [Member]    
Recorded investment in loans 33,887 34,203
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Recorded investment in loans 53,381 50,978
Nonperforming Financial Instruments [Member]    
TDR accruing 848 858
TDR nonaccrual 471 106
Recorded investment in loans 1,319 964
TDR related allowance for loan losses 52
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
TDR accruing 350 487
TDR nonaccrual 306 106
Recorded investment in loans 656 593
TDR related allowance for loan losses 52
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
TDR accruing 278 356
TDR nonaccrual 165
Recorded investment in loans 443 356
TDR related allowance for loan losses
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]    
TDR accruing 220
TDR nonaccrual
Recorded investment in loans 220
TDR related allowance for loan losses
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
TDR accruing 15
TDR nonaccrual
Recorded investment in loans 15
TDR related allowance for loan losses