Note 13 - Asset Retirement Obligation (Tables)

12 Months Ended

Dec. 31, 2013

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation [Table Text Block]

	Year Ended December 31,
	2013			2012
	(Dollars in thousands)
Balance at beginning of year	$	19,289		$	21,284
Revisions in estimated cash flows		(2,742	)		(3,696	)
Liabilities incurred		588			—
Accretion expense		1,544			1,701
Balance at end of year	$	18,679		$	19,289