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Note 3 - Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Accrual Status (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Recorded investment in loans $ 399,152 $ 385,764
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Recorded investment in loans 135,240 138,377
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Recorded investment in loans 93,843 96,669
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Recorded investment in loans 47,139 43,831
Nonperforming Financial Instruments [Member]    
TDR related allowance for loan losses 0 0
TDR accruing 836 742
TDR nonaccrual 101 397
Recorded investment in loans 937 1,139
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
TDR related allowance for loan losses 0 0
TDR accruing 390 433
TDR nonaccrual 0 229
Recorded investment in loans 390 662
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
TDR related allowance for loan losses 0 0
TDR accruing 429 291
TDR nonaccrual 101 168
Recorded investment in loans 530 459
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
TDR related allowance for loan losses 0 0
TDR accruing 17 18
TDR nonaccrual 0 0
Recorded investment in loans $ 17 $ 18