Note 10 - Postretirement Medical Benefits (Tables)

9 Months Ended

Sep. 30, 2016

Postretirement Medical Benefits [Member]

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(In thousands)	2016		2015		2016		2015
Service cost	$	159	$	185	$	478	$	554
Interest cost		171		162		512		487
Recognized prior service cost		12		13		37		38
Recognized net actuarial loss		-		10		-		31
Net periodic benefit cost	$	342	$	370	$	1,027	$	1,110