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Note 3 - Accumulated Other Comprehensive (Loss) Income (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Three Months Ended March 31, 2018
    
Three Months Ended March 31, 2017
  
(In thousands)
  
Unrealized
Gains
(Losses) on
Available
for Sale
Investment
Securities
    
Postretirement
Benefit
Obligation
    
Total
    
Unrealized
Gains
(Losses) on
Available
for Sale
Investment Securities
    
Postretirement
Benefit
Obligation
    
Total
  
Beginning balance
   $
(3,510
 )   $
(56
 )   $
(3,566
 )   $
(3,363
 )   $
(45
 )   $
(3,408
 )
Other comprehensive (loss) income before reclassifications
    
(4,102
 )    
-
      
(4,102
 )    
948
      
10
      
958
  
Amounts reclassified from accumulated other comprehensive income
    
-
      
(1
 )    
(1
 )    
6
      
49
      
55
  
Net current-period other comprehensive (loss) income
    
(4,102
 )    
(1
 )    
(4,103
 )    
954
      
59
      
1,013
  
Adoption of Accounting Standards Update 2016-01
    
(56
 )    
-
      
(56
 )    
-
      
-
      
-
  
Ending balance
   $
(7,668
 )   $
(57
 )   $
(7,725
 )   $
(2,409
 )   $
14
     $
(2,395
 )
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
   
Amount Reclassified from Accumulated Other Comprehensive Income
  
Affected Line Item in the
Statement Where Net Income is
Presented
(In thousands)
  
Three Months Ended March 31, 2018
    
Three Months Ended March 31, 2017
    
Unrealized gains (losses) on available for sale investment securities
   $
-
     $
(9
 )
Net loss on sales of available for sale investment securities
     
-
      
3
  
Income tax expense
    $
-
     $
(6
 )
Net of tax
                   
Amortization related to postretirement benefits
                  
Prior service costs
   $
-
     $
(75
 )
Salaries and employee benefits
Actuarial gains (losses)
    
1
      
(1
 )
Other noninterest expense
     
1
      
(76
 )
Total before tax
     
-
      
27
  
Income tax expense
    $
1
     $
(49
 )
Net of tax
                   
Total reclassifications for the period
   $
1
     $
(55
 )
Net of tax