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Note 4 - Loans and Allowance for Loan Losses (Details) - Allowance for Loan Losses and the Recorded Investment of Loans Based On Impairment Method - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Ending allowance balance attributable to loans:        
Individually evaluated for impairment $ 2,212 $ 2,164    
Collectively evaluated for impairment 4,734 4,484    
Total ending allowance balance 6,946 6,648 $ 8,320 $ 8,334
Loans:        
Loans individually evaluated for impairment 17,839 17,228    
Loans collectively evaluated for impairment 568,006 568,524    
Total ending loans balance 585,845 585,752    
Residential Portfolio Segment [Member]        
Ending allowance balance attributable to loans:        
Collectively evaluated for impairment 1,185 1,087    
Total ending allowance balance 1,185 1,087 1,465 1,426
Loans:        
Loans individually evaluated for impairment 730 1,001    
Loans collectively evaluated for impairment 226,296 222,874    
Total ending loans balance 227,026 223,875    
Commercial Real Estate Portfolio Segment [Member]        
Ending allowance balance attributable to loans:        
Individually evaluated for impairment 309 311    
Collectively evaluated for impairment 1,686 1,648    
Total ending allowance balance 1,995 1,959 4,210 4,195
Loans:        
Loans individually evaluated for impairment 8,022 7,318    
Loans collectively evaluated for impairment 161,338 161,994    
Total ending loans balance 169,360 169,312    
Commercial and Industrial Portfolio Segment [Member]        
Ending allowance balance attributable to loans:        
Individually evaluated for impairment 1,900 1,850    
Collectively evaluated for impairment 772 739    
Total ending allowance balance 2,672 2,589 1,738 1,602
Loans:        
Loans individually evaluated for impairment 8,869 8,691    
Loans collectively evaluated for impairment 72,165 73,245    
Total ending loans balance 81,034 81,936    
Consumer Portfolio Segment [Member]        
Ending allowance balance attributable to loans:        
Individually evaluated for impairment 3 3    
Collectively evaluated for impairment 1,091 1,010    
Total ending allowance balance 1,094 1,013 $ 907 $ 1,111
Loans:        
Loans individually evaluated for impairment 218 218    
Loans collectively evaluated for impairment 108,207 110,411    
Total ending loans balance $ 108,425 $ 110,629