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Note 3 - Loans and Allowance for Loan Losses (Details Textual)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Loans Charge-off Period 90 days    
Financing Receivable, Allowance for Credit Losses, Write-downs $ 288,000 $ 223,000  
Collateral Dependent Loans, Value of Significant Properties 200,000    
Mortgage Loans in Process of Foreclosure, Amount $ 738,000   $ 793,000
Financing Receivable, Allowance for Credit Losses, Loss Factor Increase 0.33%    
Financing Receivable, Allowance for Credit Losses, Loss Factor 20.00%    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance $ 711,000   754,000
Impaired Financing Receivable, Interest Income, Cash Basis Method 0 $ 0  
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0   0
Financing Receivable, Modifications, Number of Contracts 0 0  
Troubled Debt Restructuring, Principal Charge-offs $ 0 $ 0  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0 0  
Classified Loans [Member]      
Allowance for Loan and Lease Losses, Period Increase (Decrease) $ 589,000   559,000
Purchased Credit Impaired Loans [Member]      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses 0 $ 6,000  
Allowance for Credit Losses, Change in Method of Calculating Impairment 0   0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses, Decreases 0 $ 0  
Qualitative Factor Past Due Loans [Member]      
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method $ 2,200,000   $ 1,800,000
Overall Qualitative Factor [Member]      
Financing Receivable, Allowance for Credit Losses Risk Factor 1.18   1.18
Allowance for Loan and Lease Losses, Period Increase (Decrease) $ 518,000   $ 501,000
Bank Overdrafts [Member]      
Loans Charge-off Period 45 days    
Other than Consumer Portfolio Segment [Member]      
Number of Loans 6    
Financing Receivable, Allowance for Credit Losses, Write-downs $ 200,000    
Minimum [Member]      
Performance Period 180 days