Note 7 - Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2014

Supplemental Cash Flow Elements [Abstract]

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

	2014		2013		2012
Interest (net of amounts capitalized)	$	14,444	$	43,610	$	23,239
Income taxes, net of refunds		43,237		65,875		42,138