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Note 6 - Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Comprehensive Income (Loss) [Table Text Block]
   
For the period ended March 31,
  
(Dollars in thousands)
  
2018
    
2017
  
Securities available for sale:
  
Before
tax
    
Tax
effect
    
Net of
tax
    
Before
tax
    
Tax
effect
    
Net of
tax
  
Net unrealized (losses) gains arising during the period
   $
(479
 )    
(133
 )    
(346
 )    
313
      
125
      
188
  
Other comprehensive income (loss)
   $
(479
 )    
(133
 )    
(346
 )    
313
      
125
      
188