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Note 9 - Allowance for Loan Losses and Credit Quality Information (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest $ 5,485,000   $ 5,485,000   $ 3,144,000      
Impaired Financing Receivable, Related Allowance 1,061,000   1,061,000   1,073,000      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses     0   0      
Loan Receivable for Which Value of Collateral Sufficient to Repay 700,000   700,000   400,000      
Financing Receivable, Modifications, Recorded Investment 2,449,000   2,449,000   3,044,000      
Loans and Leases Receivable, Impaired, Commitment to Lend $ 1,000,000   $ 1,000,000   800,000      
Loan to Value Ratio 75.00%   75.00%          
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0 0 0 2        
Allowance for Credit Losses, Change in Method of Calculating Impairment $ 600,000   $ 600,000   $ 900,000      
Percentage Reserves For Loan Losses On Troubled Debt Restructurings 7.20%   7.20%   9.80%      
Loans and Leases Receivable, Allowance, Ending Balance $ 8,832,000 $ 9,277,000 $ 8,832,000 $ 9,277,000 $ 9,311,000 $ 9,328,000 $ 10,045,000 $ 9,903,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 200,000   200,000          
Provision for Loan and Lease Losses, Total     (482,000) (582,000)        
Acquired Loans [Member]                
Provision for Loan and Lease Losses, Total 0   0          
Nonperforming Financial Instruments [Member]                
Impaired Financing Receivable, Related Allowance 900,000   900,000   900,000      
Financing Receivable, Modifications, Recorded Investment 1,521,000   1,521,000   1,914,000      
Nonperforming Financial Instruments [Member] | Classified [Member]                
Financing Receivable, Modifications, Recorded Investment   200,000   200,000        
Performing Financial Instruments [Member]                
Financing Receivable, Modifications, Recorded Investment $ 928,000   $ 928,000   $ 1,130,000      
Performing Financial Instruments [Member] | Classified [Member]                
Financing Receivable, Modifications, Recorded Investment   $ 34,000   $ 34,000