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Note 7 - Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2018
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,
  
   
2018
    
2017
    
2018
    
2017
  
Service cost
   $
602
     $
671
     $
194
     $
312
  
Interest cost
    
632
      
650
      
141
      
204
  
Expected return on plan assets
    
(1,103
)
    
(1,191
)
    
-
      
-
  
Amortization of prior service cost
    
-
      
-
      
(282
)
    
-
  
Recognized actuarial loss (gain)
    
421
      
459
      
(104
)
    
(169
)
Settlement loss
    
2,229
      
1,713
      
-
      
-
  
Net periodic benefit cost
   $
2,781
     $
2,302
     $
(51
)
   $
347
  
   
Pension Benefits
    
Postretirement Benefits
  
   
Six
Months Ended

June
3
0
,
    
Six
Months Ended

June
3
0
,
  
   
2018
    
2017
    
2018
    
2017
  
Service cost
   $
1,295
     $
1,422
     $
388
     $
624
  
Interest cost
    
1,238
      
1,319
      
282
      
407
  
Expected return on plan assets
    
(2,307
)
    
(2,387
)
    
-
      
-
  
Amortization of prior service cost
    
-
      
-
      
(565
)
    
-
  
Recognized actuarial loss (gain)
    
818
      
949
      
(207
)
    
(337
)
Settlement loss
    
2,616
      
3,393
      
-
      
-
  
Net periodic benefit cost
   $
3,660
     $
4,696
     $
(102
)
   $
694
  
Schedule of the Reclassification of Retirement Benefits [Table Text Block]
   
Three
    
Six
  
   
Months ended June 30,
  
   
201
7
    
201
7
  
Cost of products sold
   $
(1,100
)
   $
(2,157
)
Selling, general and administrative expenses
    
(567
)
    
(1,187
)
Total amount reclassified
   $
(1,667
)
   $
(3,344
)