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Note 9 - Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Net unrealized
    
Net unrealized
    
Minimum
    
 
 
 
   
gains on
    
gains (losses)
    
pension
    
 
 
 
   
securities
    
on cash
    
liability
    
 
 
 
(in thousands)
  
available-for-sale
    
flow hedges
    
adjustment
    
Total
  
                                 
Balance at December 31, 201
5
   $
965
     $
(60
 )   $
(273
 )   $
632
  
                                 
Net current period other comprehensive
gain (loss)
   
4,110
      
(301
 )    
-
      
3,809
  
Balance at
September 30, 2016
   $
5,075
     $
(361
 )   $
(273
 )   $
4,441
  
                                 
                                 
Balance at
December 31, 2016
   $
(1,211
 )   $
(16
 )   $
(272
 )   $
(1,499
 )
                                 
Net current period other comprehensive income
gain
   
950
      
38
      
-
      
988
  
Amounts reclassified from other comprehensive income
    
(20
 )    
-
      
-
      
(20
 )
Net current-period other comprehensive income
    
930
      
38
      
-
      
968
  
Balance at
September 30, 2017
   $
(281
 )   $
22
     $
(272
 )   $
(531
 )