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Note 10 - Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Net unrealized
    
Net unrealized
    
Minimum
    
 
 
 
   
gains (losses)
    
gains (losses)
    
pension
    
 
 
 
   
on securities
    
on cash
    
liability
    
 
 
 
(In thousands)
  
available for sale
    
flow hedges
    
adjustment
    
Total
  
                                 
Balance, January 1, 2018
   $
(1,781
 )   $
193
     $
(342
 )   $
(1,930
 )
                                 
Net current period other comprehensive income (loss)
    
(3,718
 )    
310
      
-
      
(3,408
 )
Reclassification adjustment for adoption of ASU 2018-02
    
(496
 )    
41
      
(51
 )    
(506
 )
Balance, March 31, 2018
   $
(5,995
 )   $
544
     $
(393
 )   $
(5,844
 )
                                 
Balance, January 1, 2019
   $
(5,330
 )   $
408
     $
(220
 )   $
(5,142
 )
                                 
Net current period other comprehensive income (loss)
    
2,794
      
(174
 )    
9
      
2,629
  
Balance, March 31, 2019
   $
(2,536
 )   $
234
     $
(211
 )   $
(2,513
 )