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Note 10 - Postretirement Medical Benefits (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   
Three months ended
    
Six months ended
  
   
June 30,
    
June 30,
  
(In thousands)
  
2017
    
2016
    
2017
    
2016
  
Service cost
   $
137
     $
159
     $
283
     $
318
  
Interest cost
    
164
      
171
      
332
      
342
  
Curtailment gain recognized
    
-
      
-
      
(351
 )    
-
  
Recognized prior service cost
    
-
      
12
      
8
      
25
  
Net periodic benefit cost
   $
301
     $
342
     $
272
     $
685