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Note 4 - Loans and Allowance for Loan Losses - Allowance for Loan Losses and the Recorded Investment of Loans Based on Impairment Method (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Individually evaluated for impairment $ 90   $ 94      
Collectively evaluated for impairment 7,549   7,405      
Total ending allowance balance 7,639 $ 7,996 7,499 $ 6,952 $ 7,315 $ 7,699
Loans individually evaluated for impairment 16,257   18,108      
Loans collectively evaluated for impairment 765,723   751,211      
Total ending loans balance 781,980   769,319      
Residential Portfolio Segment [Member]            
Individually evaluated for impairment        
Collectively evaluated for impairment 1,886   1,470      
Total ending allowance balance 1,886 2,059 1,470 1,300 1,392 939
Loans individually evaluated for impairment 1,627   1,420      
Loans collectively evaluated for impairment 303,691   307,743      
Total ending loans balance 305,318   309,163      
Commercial Real Estate Portfolio Segment [Member]            
Individually evaluated for impairment 90   94      
Collectively evaluated for impairment 2,302   2,884      
Total ending allowance balance 2,392 2,423 2,978 2,813 2,729 4,315
Loans individually evaluated for impairment 5,593   7,333      
Loans collectively evaluated for impairment 216,942   206,113      
Total ending loans balance 222,535   213,446      
Commercial and Industrial Portfolio Segment [Member]            
Individually evaluated for impairment        
Collectively evaluated for impairment 1,242   1,024      
Total ending allowance balance 1,242 1,373 1,024 932 1,360 907
Loans individually evaluated for impairment 9,037   9,154      
Loans collectively evaluated for impairment 105,801   97,935      
Total ending loans balance 114,838   107,089      
Consumer Portfolio Segment [Member]            
Individually evaluated for impairment        
Collectively evaluated for impairment 2,119   2,027      
Total ending allowance balance 2,119 $ 2,141 2,027 $ 1,907 $ 1,834 $ 1,538
Loans individually evaluated for impairment   201      
Loans collectively evaluated for impairment 139,289   139,420      
Total ending loans balance $ 139,289   $ 139,621