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Note 4 - TDR Loan Modifications (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Interest Only Payments [Member]    
Troubled Debt Restructuring $ 726 $ 1,001
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   433
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring   300
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring   396
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Reduction of Principal and Interest Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   604
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Extended Maturity [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   1,996
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   204
Performing Financial Instruments [Member] | Commercial and Industrial Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 7,462  
Performing Financial Instruments [Member] | Commercial and Industrial Portfolio Segment [Member] | Interest Only Payments [Member]    
Troubled Debt Restructuring   7,579
Performing Financial Instruments [Member] | Commercial and Industrial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 980  
Performing Financial Instruments [Member] | Commercial and Industrial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]    
Troubled Debt Restructuring   226
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Extended Maturity [Member] | Home Equity Loan [Member]    
Troubled Debt Restructuring 218 218
Performing Financial Instruments [Member] | Interest Only Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 389  
Performing Financial Instruments [Member] | Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 539  
Performing Financial Instruments [Member] | Contractual Interest Rate Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 390  
Performing Financial Instruments [Member] | Reduction of Principal and Interest Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 592  
Performing Financial Instruments [Member] | Extended Maturity [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 1,932  
Performing Financial Instruments [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 204  
Performing Financial Instruments [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 575  
Performing Financial Instruments [Member]    
Troubled Debt Restructuring 14,007 12,957
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring   2,473
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   232
Nonperforming Financial Instruments [Member] | Commercial and Industrial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 391  
Nonperforming Financial Instruments [Member] | Commercial and Industrial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]    
Troubled Debt Restructuring   391
Nonperforming Financial Instruments [Member] | Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 2,148  
Nonperforming Financial Instruments [Member] | Contractual Interest Rate Reduction [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 232  
Nonperforming Financial Instruments [Member]    
Troubled Debt Restructuring 2,771 3,096
Residential Portfolio Segment [Member] | Interest Only Payments [Member]    
Troubled Debt Restructuring 726 1,001
Commercial Real Estate Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   433
Commercial Real Estate Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring   2,773
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   232
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring   396
Commercial Real Estate Portfolio Segment [Member] | Reduction of Principal and Interest Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   604
Commercial Real Estate Portfolio Segment [Member] | Extended Maturity [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   1,996
Commercial Real Estate Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   204
Commercial and Industrial Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 7,462  
Commercial and Industrial Portfolio Segment [Member] | Interest Only Payments [Member]    
Troubled Debt Restructuring   7,579
Commercial and Industrial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 1,371  
Commercial and Industrial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]    
Troubled Debt Restructuring   617
Consumer Portfolio Segment [Member] | Extended Maturity [Member] | Home Equity Loan [Member]    
Troubled Debt Restructuring 218 218
Interest Only Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 389  
Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 2,687  
Contractual Interest Rate Reduction [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 232  
Contractual Interest Rate Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 390  
Reduction of Principal and Interest Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 592  
Extended Maturity [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 1,932  
Interest Rate Below Market Reduction [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 204  
Interest Rate Below Market Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 575  
Troubled Debt Restructuring $ 16,778 $ 16,053