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Note 5 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Threshold Period for Considering Loans as Special Mention or Classified 75 days    
Financing Receivable, Modifications, Number of Contracts 4 6 5
Allowance for Credit Losses, Change in Method of Calculating Impairment     $ 206
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0 0 0
Interest and Fee Income, Loans and Leases $ 29,365 $ 30,446 $ 31,058
Nonperforming Financial Instruments [Member]      
Interest and Fee Income, Loans and Leases $ 0 $ 0 $ 0
Construction Loans [Member] | Become Non-Revolving and Interest Only Payments [Member]      
Financing Receivable, Modifications, Number of Contracts   2  
Commercial Non Real Estate Segment [Member]      
Financing Receivable, Modifications, Number of Contracts 1    
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]      
Financing Receivable, Modifications, Number of Contracts 1    
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]      
Financing Receivable, Modifications, Number of Contracts   3 1
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member] | Forgive Principal, Reduce Interest Rate, Capitalize Interest, and Re-amortize Payments [Member]      
Financing Receivable Modifications Principal Forgiven   $ 100  
Allowance for Credit Losses, Change in Method of Calculating Impairment   $ 0  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member] | Interest Only Payments [Member]      
Financing Receivable, Modifications, Number of Contracts   2  
Allowance for Credit Losses, Change in Method of Calculating Impairment   $ 23  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member] | Contractual Interest Rate Reduction [Member]      
Financing Receivable, Modifications, Number of Contracts     2
Commercial Real Estate Portfolio Segment [Member] | Commercia Real Estate Non-Owner Occupied [Member]      
Financing Receivable, Modifications, Number of Contracts     2
Commercial Real Estate Portfolio Segment [Member] | Commercia Real Estate Non-Owner Occupied [Member] | Interest Only Payments [Member]      
Financing Receivable, Modifications, Number of Contracts     2
Commercial Portfolio Segment [Member] | Extended Maturity [Member]      
Financing Receivable, Modifications, Number of Contracts   1  
Allowance for Credit Losses, Change in Method of Calculating Impairment   $ 0  
Special Mention [Member]      
Increase in Percentage of Allocation Loans Rated Special Mention 50.00%    
Classified Excluding Impaired [Member]      
Increase in Percentage of Allocation Loans Rated Classified 100.00%