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Note 4 - Troubled Debt Restructuring by Accrual Status (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
TDR Accruing $ 342,000 $ 342,000
TDR Nonaccrual 328,000 315,000
TDR Total 670,000 657,000
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 1,339,000 1,348,000
TDR Nonaccrual 252,000 294,000
TDR Total 1,591,000 1,642,000
TDR Related Allowance for Loan Losses 0 0
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]    
TDR Accruing 0 0
TDR Nonaccrual 0 0
TDR Total 0 0
TDR Related Allowance for Loan Losses 0 0
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
TDR Accruing 19,000 20,000
TDR Nonaccrual 0 0
TDR Total 19,000 20,000
TDR Related Allowance for Loan Losses 0 0
Nonperforming Financial Instruments [Member]    
TDR Accruing 1,700,000 1,710,000
TDR Nonaccrual 580,000 609,000
TDR Total 2,280,000 2,319,000
TDR Related Allowance for Loan Losses 0 0
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
TDR Total 144,876,000 148,575,000
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
TDR Total 86,963,000 84,728,000
Commercial Portfolio Segment [Member]    
TDR Total 24,651,000 23,153,000
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
TDR Total 38,555,000 39,177,000
TDR Total $ 362,196,000 $ 363,942,000