Note 11 - Postretirement Medical Benefits (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

Three months ended March 31, (In thousands)	2018		2017
Service cost	$	140	$	146
Interest cost		153		167
Curtailment gain recognized		-		(417	)
Recognized prior service cost		-		75
Net periodic benefit cost	$	293	$	(29	)