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Note 10 - Postretirement Medical Benefits (Tables)
3 Months Ended
Mar. 31, 2016
Postretirement Medical Benefits [Member]  
Note 10 - Postretirement Medical Benefits (Tables) [Line Items]  
Schedule of Net Benefit Costs [Table Text Block]
             

Three months ended March 31, (In thousands)

 

2016

   

2015

 

Service cost

  $ 159     $ 185  

Interest cost

    171       162  

Recognized prior service cost

    13       13  

Recognized net actuarial loss

    -       10  

Net periodic benefit cost

  $ 343     $ 370