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Note 8 - Components of Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 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 $1,454
    
2,701
      
---
      
2,701
  
Balance at
June 30
, 2017
   $
(887
)
   $
(5,071
)
   $
(5,958
)
                         
Balance at December 31, 201
7
   $
(3,704
)
   $
(5,991
)
   $
(9,695
)
Unrealized holding loss on available for sale securities net of tax of ($861)
    
(3,237
)
    
---
      
(3,237
 )
Unrealized holding gain on securities transferred from held to maturity to available for sale, net of tax of $237
  
 
891
      
---
      
891
  
Balance at
June 30
, 2018
  
$
(6,050
)
  
$
(5,991
)
  
$
(12,041
)