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Note 3 - Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Comprehensive Income (Loss) [Table Text Block]
   
For the years ended December 31,
  
   
2020
    
2019
    
2018
  
(Dollars in thousands
)
  
Before
Tax
    
Tax
Effect
    
Net
of Tax
    
Before
Tax
    
Tax
Effect
    
Net
of Tax
    
Before
Tax
    
Tax
Effect
    
Net
of Tax
  
Securities available for sale:                                                                        
Unrealized gains (losses) arising during the period
  
$
1,714
    
 
478
    
 
1,236
      
1,585
      
443
      
1,142
      
(94
 )    
(25
 )    
(69
 )
Other comprehensive income (loss)
  
$
1,714
    
 
478
    
 
1,236
      
1,585
      
443
      
1,142
      
(94
 )    
(25
 )    
(69
 )