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Note 1 - Summary of Significant Accounting Policies (Details Textual)
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Loan Payments Delinquency Period Beyond Which Loan is Considered Past Due 90 days    
Nonaccrual Loans Performance Period 180 days    
Collateral Dependent Loans, Value of Significant Properties $ 200,000    
Financing Receivable, Allowance for Credit Losses, Write-downs 936,000 $ 918,000 $ 1,679,000
Impaired Financing Receivable, Recorded Investment 3,423,000 3,707,000  
Impaired Financing Receivable, Unpaid Principal Balance 3,824,000 4,400,000  
Loans and Leases Receivable, Commitments, Fixed Rates 736,000    
Reclassification from AOCI to Retained Earnings for Change in Federal Tax Rate    
AOCI Attributable to Parent [Member]      
Reclassification from AOCI to Retained Earnings for Change in Federal Tax Rate (352,000)    
Retained Earnings [Member]      
Reclassification from AOCI to Retained Earnings for Change in Federal Tax Rate 352,000    
Accounting Standards Update 2018-02 [Member] | AOCI Attributable to Parent [Member]      
Reclassification from AOCI to Retained Earnings for Change in Federal Tax Rate (352,000)    
Accounting Standards Update 2018-02 [Member] | Retained Earnings [Member]      
Reclassification from AOCI to Retained Earnings for Change in Federal Tax Rate $ 352,000    
Bank Overdrafts [Member]      
Threshold Period Past Due for Write-off of Financing Receivable 45 days    
Consumer Portfolio Segment [Member]      
Threshold Period Past Due for Write-off of Financing Receivable 90 days    
Impaired Loans Partially Charged-off [Member]      
Financing Receivable, Allowance for Credit Losses, Write-downs $ 15,000 $ 10,000  
Number of Loans 7 8  
Impaired Financing Receivable, Recorded Investment $ 612,000 $ 390,000  
Impaired Financing Receivable, Unpaid Principal Balance 867,000 869,000  
Impaired Financing Receivable, Accumulated Charge-offs $ 180,000 $ 345,000  
Maximum [Member]      
Maturity of Time Deposits 90 days