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Note 6 - Premises and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
December
31,
  
   
20
17
    
20
16
  
Premises
  
$
12,434
     $
12,554
  
Furniture and equipment
  
 
5,238
      
5,052
  
Premises and equipment
  
$
17,672
     $
17,606
  
Accumulated depreciation
  
 
(9,451
)
    
(8,753
)
Premises and equipment, net
  
$
8,221
     $
8,853