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Note 8 - Changes in Accumulated Other Comprehensive Income (Loss) By Component (1) (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Unrealized Gains (Losses) on Available-For-Sale Securities
    
Unrealized Holding Losses on Securities Transferred From Available-For-Sale To Held-To-Maturity
    
Total
  
(dollars in thousands)
  
 
 
 
  
 
 
 
  
 
 
 
Balance January 1, 2018
   $
(7,150
 )   $
(359
 )   $
(7,509
 )
Reclassification due to the adoption of ASU 2018-02
    
(1,562
 )    
(78
 )    
(1,640
 )
Unrealized loss on securities
    
(9,536
 )    
-
      
(9,536
 )
Amounts reclassified from accumulated other comprehensive income to net income (2)
    
1
      
83
      
84
  
Net current-period other comprehensive income (loss)
    
(9,535
 )    
83
      
(9,452
 )
Balance September 30, 2018
   $
(18,247
 )   $
(354
 )   $
(18,601
 )
                         
Balance January 1, 2017
   $
(6,831
 )   $
(463
 )   $
(7,294
 )
Unrealized gain on securities
    
1,676
      
-
      
1,676
  
Amounts reclassified from accumulated other comprehensive income to net income (2)
    
39
      
83
      
122
  
Net current-period other comprehensive income
    
1,715
      
83
      
1,798
  
Balance September 30, 2017
   $
(5,116
 )   $
(380
 )   $
(5,496
 )
                         
Balance January 1, 2017
   $
(6,831
 )   $
(463
 )   $
(7,294
 )
Unrealized loss on securities
    
(413
 )    
-
      
(413
 )
Amounts reclassified from accumulated other comprehensive income to net income (2)
    
94
      
104
      
198
  
Net current-period other comprehensive income (loss)
    
(319
 )    
104
      
(215
 )
Balance December 31, 2017
   $
(7,150
 )   $
(359
 )   $
(7,509
 )