Note 10 - Postretirement Medical Benefits (Tables)

6 Months Ended

Jun. 30, 2016

Postretirement Medical Benefits [Member]

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended				Six Months Ended
	June 30,				June 30,
(In thousands)	2016		2015		2016		2015
Service cost	$	159	$	184	$	318	$	369
Interest cost		171		163		342		325
Recognized prior service cost		12		12		25		25
Recognized net actuarial loss (gain)		-		11		-		21
Net periodic benefit cost	$	342	$	370	$	685	$	740