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Note 8 - Reclassifications Out of Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Details about Other Comprehensive
Components
  
Amounts Reclassified from
Other Comprehensive Income
for the Three Months Ended March
31,
  
Affected Line Item in the Statement
Where Net Income is Presented
(Dollars in Thousands)
  
2017
    
2016
  
 
Available for sale securities
  
 
 
 
  
 
 
 
  
Realized gains on sales of securities held for sale during the period
   $
13
     $
5
  
Gains on sales of investment securities
Tax expense related to realized gains on securities sold
    
4
      
2
  
Income tax expense
    $
9
     $
3
  
Net income