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Note 8 - Components of Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 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 $580
    
1,075
      
---
      
1,075
  
Balance at
March 31, 2017
   $
(2,513
)
   $
(5,071
)
   $
(7,584
)
                         
Balance at December 31, 201
7
   $
(3,704
)
   $
(5,991
)
   $
(9,695
)
Unrealized holding gain on available for sale securities net of tax of ($706)
    
(2,655
)
    
---
      
(2,655
 )
Balance at
March 31, 2018
  
$
(6,359
)
  
$
(5,991
)
  
$
(12,350
)