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Note 9 - Allowance for Loan Losses and Credit Quality Information (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2016
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest $ 3,016,000 $ 3,016,000   $ 3,144,000      
Impaired Financing Receivable, Related Allowance 794,000 794,000   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 600,000 600,000   400,000      
Financing Receivable, Modifications, Recorded Investment 2,555,000 2,555,000   3,044,000      
Loans and Leases Receivable, Impaired, Commitment to Lend $ 1,200,000 $ 1,200,000   800,000      
Loan to Value Ratio 75.00% 75.00%          
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 6.80% 6.80%   9.80%      
Loans and Leases Receivable, Allowance, Ending Balance $ 9,328,000 $ 9,328,000 $ 10,045,000 $ 9,311,000 $ 9,129,000 $ 9,590,000 $ 9,903,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 400,000 400,000          
Provision for Loan and Lease Losses, Total   170,000 (1,000)        
Acquired Loans [Member]              
Provision for Loan and Lease Losses, Total 0 0          
Nonperforming Financial Instruments [Member]              
Impaired Financing Receivable, Related Allowance 700,000 700,000   900,000      
Financing Receivable, Modifications, Recorded Investment 1,596,000 1,596,000   1,915,000      
Nonperforming Financial Instruments [Member] | Classified [Member]              
Financing Receivable, Modifications, Recorded Investment 26,000 26,000 200,000        
Performing Financial Instruments [Member]              
Financing Receivable, Modifications, Recorded Investment 959,000 959,000   $ 1,129,000      
Performing Financial Instruments [Member] | Classified [Member]              
Financing Receivable, Modifications, Recorded Investment $ 200,000 $ 200,000 $ 100,000