Note 10 - Postretirement Medical Benefits (Tables)

9 Months Ended

Sep. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
(In thousands)	2015		2014			2015		2014
Service cost	$	185	$	121		$	554	$	362
Interest cost		162		142			487		427
Recognized prior service cost		13		51			38		155
Recognized net actuarial loss (gain)		10		(15	)		31		(47	)
Net periodic benefit cost	$	370	$	299		$	1,110	$	897