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Note 5 - Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Comprehensive Income (Loss) [Table Text Block]
(In Thousands)
  
Before-Tax
    
Income Tax
    
Net-of-Tax
  
   
Amount
    
Effect
    
Amount
  
2019
  
 
 
 
  
 
 
 
  
 
 
 
Unrealized gains on available-for-sale debt securities:
                        
Unrealized holding gains on available-for-sale securities
   $
9,920
     $
(2,084
 )   $
7,836
  
Reclassification adjustment for gains realized in income
    
(23
 )    
5
      
(18
 )
Other comprehensive income on available-for-sale debt securities
    
9,897
      
(2,079
 )    
7,818
  
                         
Unfunded pension and postretirement obligations:
                        
Changes from plan amendments and actuarial gains and losses included in other comprehensive income
    
87
      
(19
 )    
68
  
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost
    
(32
 )    
7
      
(25
 )
Other comprehensive income on unfunded retirement obligations
    
55
      
(12
 )    
43
  
                         
Total other comprehensive income
   $
9,952
     $
(2,091
 )   $
7,861
  
(In Thousands)
  
Before-Tax
    
Income Tax
    
Net-of-Tax
  
   
Amount
    
Effect
    
Amount
  
2018
  
 
 
 
  
 
 
 
  
 
 
 
Unrealized losses on available-for-sale debt securities:
                        
Unrealized holding losses on available-for-sale securities
   $
(3,392
 )   $
712
     $
(2,680
 )
Reclassification adjustment for losses realized in income
    
288
      
(60
 )    
228
  
Other comprehensive loss on available-for-sale debt securities
    
(3,104
 )    
652
      
(2,452
 )
                         
Unfunded pension and postretirement obligations:
                        
Changes from plan amendments and actuarial gains and losses included in other comprehensive income
    
101
      
(21
 )    
80
  
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost
    
(17
 )    
3
      
(14
 )
Other comprehensive income on unfunded retirement obligations
    
84
      
(18
 )    
66
  
                         
Total other comprehensive loss
   $
(3,020
 )   $
634
     $
(2,386
 )
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
In (Thousands)
  
Unrealized
    
 
 
 
  
Accumulated
  
   
Gains
    
Unfunded
    
Other
  
   
(Losses)
    
Retirement
    
Comprehensive
  
   
on Securities
    
Obligations
    
Income (Loss)
  
2019
  
 
 
 
  
 
 
 
  
 
 
 
Balance, beginning of period
   $
(4,307
 )   $
137
     $
(4,170
 )
Other comprehensive income during year ended December 31, 2019
    
7,818
      
43
      
7,861
  
Balance, end of period
   $
3,511
     $
180
     $
3,691
  
                         
2018
  
 
 
 
  
 
 
 
  
 
 
 
Balance, beginning of period
   $
(1,566
 )   $
59
     $
(1,507
 )
Impact of change in enacted income tax rate
    
(337
 )    
12
      
(325
 )
Impact of change in the method of premium amortization of callable debt securities
    
26
      
0
      
26
  
Impact of change in the method of accounting for marketable equity security
    
22
      
0
      
22
  
Other comprehensive (loss) income during year ended December 31, 2018
    
(2,452
 )    
66
      
(2,386
 )
Balance, end of period
   $
(4,307
 )   $
137
     $
(4,170
 )
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
For the Year Ended December 31, 2019
  
 
 
 
    
(In Thousands)
          
 
  
Reclassified from
      
   
Accumulated Other
      
Details about Accumulated Other
 
Comprehensive
    
Affected Line Item in the Consolidated
Comprehensive Income (Loss) Components
  
Income (Loss)
    
Statements of Income
Unrealized gains and losses on available-for-sale debt securities
   $
(23
 )  
Realized gains on available-for-sale debt securities, net
     
5
    
Income tax provision
     
(18
 )  
Net of tax
Amortization of defined benefit pension and postretirement items:
            
Prior service cost
    
(31
 )  
Other noninterest expense
Actuarial gain
    
(1
 )  
Other noninterest expense
     
(32
 )  
Total before tax
     
7
    
Income tax provision
     
(25
 )  
Net of tax
Total reclassifications for the period
   $
(43
 )  
 
For the Year Ended December 31, 2018
  
 
 
 
    
(In Thousands)
  
 
 
 
    
   
Reclassified from
      
   
Accumulated Other
      
Details about Accumulated Other
 
Comprehensive
    
Affected Line Item in the Consolidated
Comprehensive Income (Loss) Components
  
Income (Loss)
    
Statements of Income
Unrealized gains and losses on available-for-sale debt securities
   $
288
    
Realized losses on available-for-sale debt securities, net
     
(60
 )  
Income tax provision
     
228
    
Net of tax
Amortization of defined benefit pension and postretirement items:
            
Prior service cost
    
(30
 )  
Other noninterest expense
Actuarial loss
    
13
    
Other noninterest expense
     
(17
 )  
Total before tax
     
3
    
Income tax provision
     
(14
 )  
Net of tax
Total reclassifications for the period
   $
214