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Note 8 - Other Real Estate Owned (OREO) (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Other Real Estate, Roll Forward [Table Text Block]
(Amounts in thousands)
  
Years Ended December 31,
  
OREO
  
2017
    
2016
    
2015
  
Balance at beginning of year
   $
759
     $
1,423
     $
502
  
Additions
    
1,071
      
189
      
4,059
  
Dispositions
    
(1,743
 )    
(745
 )    
(3,138
 )
Valuation adjustments
    
(52
 )    
(108
 )    
—
  
Total
   $
35
     $
759
     $
1,423