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Note 8 - Components of Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Net Unrealized
Gain (Loss) on
Securities
    
Adjustments Related
to Pension Benefits
    
Accumulated Other
Comprehensive
Loss
  
Balance at December 31, 201
5
   $
(2,667
)
   $
(5,270
)
   $
(7,937
)
Unrealized holding
gain on available for sale securities, net of tax of $1,802
    
3,348
      
---
      
3,348
  
Reclassification adjustment, net of tax of ($
2)
    
(4
)
    
---
      
(4
)
Balance at
March 31, 2016
   $
677
     $
(5,270
)
   $
(4,593
)
                         
Balance at December 31, 201
6
   $
(3,588
)
   $
(5,071
)
   $
(8,659
)
Unrealized holding
gain on available for sale securities net of tax of $580
    
1,075
      
---
      
1,075
  
Reclassification adjustment, net of tax of
$0
    
---
      
---
      
---
  
Balance at
March 31, 2017
  
$
(2,513
)
  
$
(5,071
)
  
$
(7,584
)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
   
Three Months Ended
  
   
March 31, 2017
    
March 31, 2016
  
Reclassifications out of unrealized gains on available-for-sale securities:
  
 
 
 
  
 
 
 
Realized securities gain, net
  
$
---
     $
(6
)
Income taxes
  
 
---
      
2
  
Realized gain on available-for-sale securities, net of tax, reclassified out of accumulated other comprehensive
loss
  
$
---
     $
(4
)