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Note 4 - Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Accrual Status (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
TDR Accruing $ 336,000 $ 342,000
TDR Nonaccrual 328,000 315,000
TDR Total 664,000 657,000
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 1,320,000 1,348,000
TDR Nonaccrual 171,000 294,000
TDR Total 1,491,000 1,642,000
TDR Related Allowance for Loan Losses 0 0
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
TDR Accruing 18,000 20,000
TDR Nonaccrual 0 0
TDR Total 18,000 20,000
TDR Related Allowance for Loan Losses 0 0
Nonperforming Financial Instruments [Member]    
TDR Accruing 1,674,000 1,710,000
TDR Nonaccrual 499,000 609,000
TDR Total 2,173,000 2,319,000
TDR Related Allowance for Loan Losses 0 0
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
TDR Total 134,442,000 148,575,000
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
TDR Total 94,017,000 84,728,000
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
TDR Total 42,948,000 39,177,000
TDR Total $ 370,866,000 $ 363,942,000