Note 10 - Postretirement Medical Benefits (Tables)

6 Months Ended

Jun. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended					Six Months Ended
	June 30,					June 30,
(In thousands)	2015		2014			2015		2014
Service cost	$	184	$	120		$	369	$	242
Interest cost		163		143			325		285
Recognized prior service cost		12		52			25		104
Recognized net actuarial loss (gain)		11		(16	)		21		(33	)
Net periodic benefit cost	$	370	$	299		$	740	$	598