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Note 3 - Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Accrual Status (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Recorded investment in loans $ 424,649,000 $ 414,617,000  
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]      
Recorded investment in loans 136,176,000 136,960,000  
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
Recorded investment in loans 104,976,000 100,340,000  
Commercial Portfolio Segment [Member]      
Recorded investment in loans 33,861,000 34,203,000  
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]      
Recorded investment in loans 52,494,000 50,978,000  
Nonperforming Financial Instruments [Member]      
TDR accruing 1,003,000 858,000  
TDR nonaccrual 106,000 106,000  
Recorded investment in loans 1,109,000 964,000  
TDR related allowance for loan losses 0 $ 0
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]      
TDR accruing 468,000 487,000  
TDR nonaccrual 106,000 106,000  
Recorded investment in loans 574,000 593,000  
TDR related allowance for loan losses  
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
TDR accruing 352,000 356,000  
TDR nonaccrual  
Recorded investment in loans 352,000 356,000  
TDR related allowance for loan losses  
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]      
TDR accruing 169,000  
TDR nonaccrual  
Recorded investment in loans 169,000  
TDR related allowance for loan losses  
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]      
TDR accruing 14,000 15,000  
TDR nonaccrual  
Recorded investment in loans 14,000 15,000  
TDR related allowance for loan losses