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Note 8 - Components of Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 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 $2,415
    
4,484
      
---
      
4,484
  
Reclassification adjustment, net of tax of ($
54)
    
(99
)
    
---
      
(99
)
Balance at
September
30, 2016
   $
1,718
     $
(5,270
)
   $
(3,552
)
                         
Balance at December 31, 201
6
   $
(3,588
)
   $
(5,071
)
   $
(8,659
)
Unrealized holding
gain on available for sale securities net of tax of $1,235
    
2,294
      
---
      
2,294
  
Reclassification adjustment, net of tax of ($1)
    
(3
)
    
---
      
(3
)
Balance at
September
30
, 2017
  
$
(1,297
)
  
$
(5,071
)
  
$
(6,368
)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
   
3 Months Ended
    
9
Months Ended
  
   
September
30,
2017
    
September
30,
2016
    
September
30,
2017
    
September
30,
2016
  
Reclassifications out of unrealized gains and losses on available-for-sale securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Realized securities gain, net
  
$
(4
)
   $
(101
)
  
$
(4
)
   $
(153
)
Income taxes
  
 
(1
)
    
(35
)
  
 
(1
)
    
(54
)
Realized gain on available-for-sale securities, net of tax, reclassified out of accumulated other comprehensive
loss
  
$
(3
)
   $
(66
)
  
$
(3
)
   $
(99
)