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Note 4 - Loans and Allowance for Loan Losses - TDR Loan Modifications (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Troubled Debt Restructuring $ 7,726 $ 8,552
Troubled Debt Restructuring 7,726 8,552
Residential Portfolio Segment [Member] | Interest Only Payments [Member]    
Troubled Debt Restructuring 207 209
Troubled Debt Restructuring 207 209
Residential Portfolio Segment [Member] | Extended Maturity [Member]    
Troubled Debt Restructuring 373  
Troubled Debt Restructuring 373  
Residential Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]    
Troubled Debt Restructuring 391  
Troubled Debt Restructuring 391  
Commercial Real Estate Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 868 882
Troubled Debt Restructuring 868 882
Commercial Real Estate Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 3,984 4,574
Troubled Debt Restructuring 3,984 4,574
Commercial Real Estate Portfolio Segment [Member] | Reduction of Principal and Interest Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 1,509 1,521
Troubled Debt Restructuring 1,509 1,521
Commercial Real Estate Portfolio Segment [Member] | Extended Maturity [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   393
Troubled Debt Restructuring   393
Commercial Real Estate Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   393
Troubled Debt Restructuring   393
Commercial Real Estate Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 394  
Troubled Debt Restructuring 394  
Commercial and Industrial Portfolio Segment [Member] | Reduction of Principal and Interest Payments [Member]    
Troubled Debt Restructuring   185
Troubled Debt Restructuring   185
Commercial and Industrial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]    
Troubled Debt Restructuring   395
Troubled Debt Restructuring   395
Performing Financial Instruments [Member]    
Troubled Debt Restructuring 7,726 8,552
Troubled Debt Restructuring 7,726 8,552
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Interest Only Payments [Member]    
Troubled Debt Restructuring 207 209
Troubled Debt Restructuring 207 209
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Extended Maturity [Member]    
Troubled Debt Restructuring 373  
Troubled Debt Restructuring 373  
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]    
Troubled Debt Restructuring 391  
Troubled Debt Restructuring 391  
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 868 882
Troubled Debt Restructuring 868 882
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 3,984 4,574
Troubled Debt Restructuring 3,984 4,574
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 1,509 1,521
Troubled Debt Restructuring 1,509 1,521
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Extended Maturity [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   393
Troubled Debt Restructuring   393
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   393
Troubled Debt Restructuring   393
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 394  
Troubled Debt Restructuring $ 394  
Performing Financial Instruments [Member] | Commercial and Industrial Portfolio Segment [Member] | Reduction of Principal and Interest Payments [Member]    
Troubled Debt Restructuring   185
Troubled Debt Restructuring   185
Performing Financial Instruments [Member] | Commercial and Industrial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]    
Troubled Debt Restructuring   395
Troubled Debt Restructuring   395
Nonperforming Financial Instruments [Member]    
Troubled Debt Restructuring  
Troubled Debt Restructuring  
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring  
Troubled Debt Restructuring  
Nonperforming Financial Instruments [Member] | Commercial and Industrial Portfolio Segment [Member] | Reduction of Principal and Interest Payments [Member]    
Troubled Debt Restructuring  
Troubled Debt Restructuring