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Note 7 - Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Costs of Retirement Plans [Table Text Block]
   
Pension Benefits
    
Postretirement Benefits
  
   
Three Months Ended

September
30,
    
Three Months Ended

September
30,
  
   
201
9
    
201
8
    
201
9
    
201
8
  
Service cost
   $
551
     $
562
     $
271
     $
194
  
Interest cost
    
614
      
644
      
235
      
141
  
Expected return on plan assets
    
(890
)
    
(1,073
)
    
-
      
-
  
Amortization of prior service cost
    
-
      
-
      
(282
)
    
(283
)
Recognized actuarial loss (gain)
    
431
      
388
      
7
      
(103
)
Settlement loss
    
 
      
120
      
-
      
-
  
Net periodic benefit cost (gain) (a)
   $
706
     $
641
     $
231
     $
(51
)
   
Pension Benefits
    
Postretirement Benefits
  
   
Nine
Months Ended

September
30,
    
Nine
Months Ended

September
30,
  
   
2019
    
2018
    
2019
    
2018
  
Service cost
   $
1,653
     $
1,857
     $
812
     $
582
  
Interest cost
    
1,841
      
1,882
      
706
      
422
  
Expected return on plan assets
    
(2,671
)
    
(3,380
)
    
-
      
-
  
Amortization of prior service cost
    
-
      
-
      
(846
)
    
(847
)
Recognized actuarial loss (gain)
    
1,294
      
1,206
      
21
      
(310
)
Settlement loss
    
-
      
2,736
      
-
      
-
  
Net periodic benefit cost (gain) (a)
   $
2,117
     $
4,301
     $
693
     $
(153
)