Note 2 - Supplemental Cash Flow Disclosure (Details) - Supplemental Disclosures of Cash Flow Information and Non-Cash Investing (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash paid for:
Interest, net of interest capitalized		$ 1,083	$ 25,190
Income taxes	5,161	577	3,532
Non-cash investing and financing activities
Unrealized holding gains (losses) on marketable securities	$ 6,737	$ 12,078	$ (12,124)