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Note 3 - Loans and Allowance for Loan Losses - Summary of Troubled Debt Restructurings (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Number of contracts 3 1 4 1
Pre-modification outstanding balance $ 390 $ 65 $ 569 $ 65
Post-modification outstanding balance $ 390 $ 65 $ 569 $ 65
Commercial Portfolio Segment [Member]        
Number of contracts 1   2  
Pre-modification outstanding balance $ 55   $ 234  
Post-modification outstanding balance $ 55   $ 234  
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]        
Number of contracts 1 1 1 1
Pre-modification outstanding balance $ 241 $ 65 $ 241 $ 65
Post-modification outstanding balance $ 241 $ 65 $ 241 $ 65
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]        
Number of contracts 1   1  
Pre-modification outstanding balance $ 94   $ 94  
Post-modification outstanding balance $ 94   $ 94