XML 43 R33.htm IDEA: XBRL DOCUMENT v3.10.0.1
Note 11 - Postretirement Medical Benefits (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   
Three Months Ended June 30,
    
Six Months Ended June 30,
  
(In thousands)
  
2018
    
2017
    
2018
    
2017
  
Service cost
   $
141
     $
137
     $
281
     $
283
  
Interest cost
    
152
      
164
      
305
      
332
  
Curtailment gain recognized
    
-
      
-
      
-
      
(351
 )
Recognized prior service cost
    
-
      
-
      
-
      
8
  
Net periodic benefit cost
   $
293
     $
301
     $
586
     $
272