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Note 7 - Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Costs of Retirement Plans [Table Text Block]
   
Pension Benefits
    
Postretirement Benefits
  
   
Three Months Ended
June 30,
    
Three Months Ended
June 30,
  
   
201
9
    
201
8
    
201
9
    
201
8
  
Service cost
   $
535
     $
602
     $
270
     $
194
  
Interest cost
    
581
      
632
      
236
      
141
  
Expected return on plan assets
    
(836
)
    
(1,103
)
    
-
      
-
  
Amortization of prior service cost
    
-
      
-
      
(282
 )    
(282
)
Recognized actuarial loss (gain)
    
472
      
421
      
7
      
(104
)
Settlement loss
    
-
      
2,229
      
-
      
-
  
Net periodic benefit cost (a)
   $
752
     $
2,781
     $
231
 
   $
(51
)
   
Pension Benefits
    
Postretirement Benefits
  
   
Six Months Ended
June 30,
    
Six Months Ended
June 30,
  
   
2019
    
2018
    
2019
    
2018
  
Service cost
   $
1,102
     $
1,295
     $
541
     $
388
  
Interest cost
    
1,227
      
1,238
      
471
      
282
  
Expected return on plan assets
    
(1,781
)
    
(2,307
)
    
-
      
-
  
Amortization of prior service cost
    
-
      
-
      
(564
)
    
(565
)
Recognized actuarial loss (gain)
    
863
      
818
      
14
      
(207
)
Settlement loss
    
-
      
2,616
      
-
      
-
  
Net periodic benefit cost (a)
   $
1,411
     $
3,660
     $
462
     $
(102
)