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Note 1 - Summary of Significant Accounting Policies (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]    
Loan Payments Delinquency Period Beyond which Loan is Considered Past-Due 90 days  
Nonaccrual Loans, Performance Period 6 months  
Financing Receivable, Allowance for Credit Losses, Write-downs $ 1,679,000 $ 620,000
Financing Receivable, Recorded Investment, Current 354,513,000 301,614,000
Impaired Financing Receivable, Unpaid Principal Balance 6,698,000 5,735,000
Loans and Leases Receivable, Commitments, Fixed Rates 589,000  
Impaired Loans Partially Charged-off [Member]    
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]    
Financing Receivable, Allowance for Credit Losses, Write-downs 0 $ 67,000
Number of Loans   10
Consumer Portfolio Segment [Member]    
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]    
Financing Receivable, Allowance for Credit Losses, Write-downs 268,000 $ 320,000
Financing Receivable, Recorded Investment, Current $ 42,169,000 34,543,000
Threshold Period Past Due for Write-off of Financing Receivable 90 days  
Twelve Loans [Member] | Impaired Loans Partially Charged-off [Member]    
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]    
Financing Receivable, Allowance for Credit Losses, Write-downs $ 410,000  
Financing Receivable, Recorded Investment, Current   646,000
Impaired Financing Receivable, Unpaid Principal Balance   $ 1,200,000
Partial Charge-off Loan [Member] | Impaired Loans Partially Charged-off [Member]    
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]    
Number of Loans   12
Eleven Loans [Member] | Impaired Loans Partially Charged-off [Member]    
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]    
Financing Receivable, Allowance for Credit Losses, Write-downs   $ 472,000
Financing Receivable, Recorded Investment, Current   757,000
Impaired Financing Receivable, Unpaid Principal Balance   $ 1,400,000
Bank Overdrafts [Member]    
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]    
Threshold Period Past Due for Write-off of Financing Receivable 45 days  
Maximum [Member]    
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]    
Maturity of Time Deposits 90 days