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Note 5 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2014
Threshold Period for Considering Loans as Special Mention or Classified 75 days      
Allowance for Credit Losses, Change in Method of Calculating Impairment $ 0 $ 0 $ 0  
Financing Receivable, Modifications, Number of Contracts 13 10 4  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0 0 0  
Commercial Non Real Estate Segment [Member]        
Financing Receivable, Modifications, Number of Contracts   4 1  
Commercial Non Real Estate Segment [Member] | Automobile Loan [Member]        
Financing Receivable, Modifications, Number of Contracts   4 1  
Commercial Non Real Estate Segment [Member] | Interest Method Changed from Variable to Fixed [Member]        
Financing Receivable, Modifications, Number of Contracts   1    
Commercial Non Real Estate Segment [Member] | Contractual Interest Rate Reduction [Member]        
Financing Receivable, Modifications, Number of Contracts   2    
Commercial Real Estate Portfolio Segment [Member]        
Financing Receivable, Modifications, Number of Contracts       2
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%