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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
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Individually evaluated for impairment $ 240   $ 2,981      
Collectively evaluated for impairment 7,073   4,718      
Total ending allowance balance 7,313 $ 6,952 7,699 $ 7,537 $ 6,934 $ 6,648
Loans individually evaluated for impairment 17,681   22,709      
Loans collectively evaluated for impairment 760,276   712,192      
Total ending loans balance 777,957   734,901      
Residential Portfolio Segment [Member]            
Individually evaluated for impairment 127        
Collectively evaluated for impairment 1,304   939      
Total ending allowance balance 1,431 1,300 939 1,013 906 1,087
Loans individually evaluated for impairment 1,153   717      
Loans collectively evaluated for impairment 317,091   285,305      
Total ending loans balance 318,244   286,022      
Commercial Real Estate Portfolio Segment [Member]            
Individually evaluated for impairment 111   2,535      
Collectively evaluated for impairment 2,849   1,780      
Total ending allowance balance 2,960 2,813 4,315 4,274 3,464 1,959
Loans individually evaluated for impairment 6,798   13,111      
Loans collectively evaluated for impairment 208,045   200,896      
Total ending loans balance 214,843   214,007      
Commercial and Industrial Portfolio Segment [Member]            
Individually evaluated for impairment   241      
Collectively evaluated for impairment 972   666      
Total ending allowance balance 972 932 907 979 1,416 2,589
Loans individually evaluated for impairment 9,522   8,465      
Loans collectively evaluated for impairment 94,028   92,124      
Total ending loans balance 103,550   100,589      
Consumer Portfolio Segment [Member]            
Individually evaluated for impairment 2   205      
Collectively evaluated for impairment 1,948   1,333      
Total ending allowance balance 1,950 $ 1,907 1,538 $ 1,271 $ 1,148 $ 1,013
Loans individually evaluated for impairment 208   416      
Loans collectively evaluated for impairment 141,112   133,867      
Total ending loans balance $ 141,320   $ 134,283