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Note 8 - Components of Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 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 $2,170
    
4,032
      
---
      
4,032
  
Reclassification adjustment, net of tax of ($1
8)
    
(34
)
    
---
      
(34
)
Balance at
June 30, 2016
   $
1,331
     $
(5,270
)
   $
(3,939
)
                         
Balance at December 31, 201
6
   $
(3,588
)
   $
(5,071
)
   $
(8,659
)
Unrealized holding
gain on available for sale securities net of tax of $1,454
    
2,701
      
---
      
2,701
  
Balance at
June 30
, 2017
  
$
(887
)
  
$
(5,071
)
  
$
(5,958
)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
   
3 Months Ended
    
6
Months Ended
  
   
June 30, 2017
    
June 30, 2016
    
June 30, 2017
    
June 30, 2016
  
Reclassifications out of unrealized gains and losses on available-for-sale securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Realized securities gain, net
  
$
---
     $
(46
)
  
$
---
     $
(52
)
Income taxes
  
 
---
      
(16
)
  
 
---
      
(18
)
Realized gain on available-for-sale securities, net of tax, reclassified out of accumulated other comprehensive
loss
  
$
---
     $
(30
)
  
$
---
     $
(34
)