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Note 8 - Marketable Securities and Other Investments (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]    
Marketable Securities $ 63,312,000 [1] $ 62,766,000 [1]
Marketable Securities, Unrealized Gain (Loss) $ 22,300,000  
[1] As of March 31, 2014 and December 31, 2013, the Company determined that $60.5 million and $59.7 million, respectively, of the Marketable securities estimated fair value were classified within Level 1 of the fair value hierarchy and the remaining $2.7 million and $3.1 million, respectively, were classified within Level 3 of the fair value hierarchy.