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Note 21 - Changes in Accumulated Other Comprehensive Income (Loss) by Component (1) (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019
   $
(4,736
 )   $
(7,191
 )   $
(11,927
 )
Unrealized gain on securities
    
4,284
      
-
      
4,284
  
Amounts reclassified from accumulated other comprehensive income to net income (2)
    
(823
 )    
1,125
      
302
  
Net current-period other comprehensive income
    
3,461
      
1,125
      
4,586
  
Total change in accumulated other comprehensive income
    
3,461
      
1,125
      
4,586
  
Balance December 31, 2019
   $
(1,275
 )   $
(6,066
 )   $
(7,341
 )
                         
Balance January 1, 2018
   $
(7,150
 )   $
(359
 )   $
(7,509
 )
Reclassification due to the adoption of ASU 2018-02
    
(1,562
 )    
(78
 )    
(1,640
 )
Unrealized gain on securities
    
3,927
      
-
      
3,927
  
Net unrealized holding losses on securities transferred from available-for-sale to held-to-maturity
    
-
      
(6,855
 )    
(6,855
 )
Amounts reclassified from accumulated other comprehensive income to net income (2)
    
49
      
101
      
150
  
Net current-period other comprehensive income (loss)
    
3,976
      
(6,754
 )    
(2,778
 )
Total change in accumulated other comprehensive income (loss)
    
2,414
      
(6,832
 )    
(4,418
 )
Balance December 31, 2018
   $
(4,736
 )   $
(7,191
 )   $
(11,927
 )
                         
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
 )
Total change in accumulated other comprehensive income (loss)
    
(319
 )    
104
      
(215
 )
Balance December 31, 2017
   $
(7,150
 )   $
(359
 )   $
(7,509
 )