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Note 10 - Postretirement Medical Benefits (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
Three months ended March 31, (In thousands)
  
2017
    
2016
  
Service cost
   $
147
     $
159
  
Interest cost
    
167
      
171
  
Curtailment gain recognized
    
(351
 )    
-
  
Recognized prior service cost
    
8
      
13
  
Net periodic benefit cost
   $
(29
 )   $
343