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Note 9 - Allowance for Loan Losses and Credit Quality Information (Details Textual)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest $ 2,522   $ 2,678  
Impaired Financing Receivable, Related Allowance 819   794  
Financing Receivable, Troubled Debt Restructuring 2,423   2,476  
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend $ 800   900  
Loan to Value Ratio 75.00%      
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 0 0    
Loans and Leases Receivable, Allowance, Reserves for TDRs $ 600   $ 600  
Percentage Reserves For Loan Losses On Troubled Debt Restructurings 7.00%   7.20%  
Loans and Leases Receivable, Allowance, Ending Balance $ 8,673 $ 9,129 $ 8,686 $ 9,311
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 200      
Provision for Loan and Lease Losses, Total 27 (125)    
Impaired Loans with Sufficient Collateral to Repay Loan [Member]        
Loan Receivable for Which Value of Collateral Sufficient to Repay 300   400  
Acquired Loans [Member]        
Provision for Loan and Lease Losses, Total 0      
Nonperforming Financial Instruments [Member]        
Impaired Financing Receivable, Related Allowance 700   700  
Financing Receivable, Troubled Debt Restructuring 1,455   1,458  
Nonperforming Financial Instruments [Member] | Classified [Member]        
Financing Receivable, Troubled Debt Restructuring   1,300    
Performing Financial Instruments [Member]        
Financing Receivable, Troubled Debt Restructuring $ 968   $ 1,018  
Performing Financial Instruments [Member] | Classified [Member]        
Financing Receivable, Troubled Debt Restructuring   $ 100