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Note 8 - Components of Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 2018
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
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
)
                         
Balance at December 31, 201
7
   $
(3,704
)
   $
(5,991
)
   $
(9,695
)
Unrealized holding loss on available for sale securities net of tax of ($1,378)
    
(5,182
)
    
---
      
(5,182
 )
Unrealized holding gain on securities transferred from held to maturity to available for sale, net of tax of $237
    
891
      
---
      
891
  
Balance at
September
30
, 2018
  
$
(7,995
)
  
$
(5,991
)
  
$
(13,986
)