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Note 2 - Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
             
Year
Ended December 31,
 
201
7
   
201
6
 
(In thousands)
  
Unrealized
Gains and
Losses on
Available
for Sale
Investment
Securities
    
Postretirement
Benefit
Obligation
    
Total
    
Unrealized
Gains and
Losses on
Available
for Sale
Investment
Securities
    
Postretirement
Benefit
Obligation
    
Total
  
Beginning balance
   $
(3,363
 )   $
(45
 )   $
(3,408
 )   $
3,219
     $
(437
 )   $
2,782
  
Other comprehensive
income (loss) before reclassifications
    
489
      
(53
 )    
436
      
(3,983
 )    
356
      
(3,627
 )
Amounts reclassified from accumulated other comprehensive income
    
(13
 )    
52
      
39
      
(2,599
 )    
36
      
(2,563
 )
Net current-period other comprehensive
income (loss)
   $
476
     $
(1
 )   $
475
     $
(6,582
 )   $
392
     $
(6,190
 )
Adoption of Accounting Standards Update 2018-
02
    
(623
 )    
(10
 )    
(633
 )    
-
      
-
      
-
  
Ending balance
   $
(3,510
 )   $
(56
 )   $
(3,566
 )   $
(3,363
 )   $
(45
 )   $
(3,408
 )
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
(In thousands)
  
Amount Reclassified from Accumulated
Other Comprehensive Income
  
Affected Line Item in the Statement
Where Net Income is Presented
Year Ended December 31,
  
201
7
    
201
6
    
201
5
    
Unrealized gains on available for sale investment securities
   $
20
     $
3,998
     $
171
  
Net gain on sales of available for sale investment securities
     
(7
 )    
(1,399
 )    
(60
 )
Income tax expense
    $
13
     $
2,599
     $
111
  
Net of tax
                           
Amortization related to postretirement benefits
                          
Prior service costs
   $
(75
 )   $
(50
 )   $
(51
 )
Salaries and employee benefits
Actuarial losses
    
(5
 )    
(5
 )    
(42
 )
Salaries and employee benefits
     
(80
 )    
(55
 )    
(93
 )
Total before tax
     
28
      
19
      
33
  
Income tax expense
    $
(52
 )   $
(36
 )   $
(60
 )
Net of tax
                           
Total reclassifications for the period
   $
(39
 )   $
2,563
     $
51
  
Net of tax