Note 8 - Marketable Securities and Other Investments (Details) (USD $)	6 Months Ended
	Jun. 30, 2013		Dec. 31, 2012
Table Text Block [Abstract]
Marketable Securities	$ 71,009,000	[1]	$ 36,541,000	[1]
Available-for-sale Securities, Gross Unrealized Gain	25,500,000
Proceeds from Sale of Available-for-sale Securities	10,600,000
Available-for-sale Securities, Gross Realized Gains	$ 5,300,000

[1] As of June 30, 2013 and December 31, 2012, the Company determined that $68.0 million and $33.4 million, respectively, of the marketable securities estimated fair value were classified within Level 1 of the fair value hierarchy and the remaining $3.3 million and $3.4 million, respectively, were classified within Level 3 of the fair value hierarchy.