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Note 8 - Marketable Securities and Other Investments (Details) - USD ($)
$ in Thousands, shares in Millions
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Note 8 - Marketable Securities and Other Investments (Details) [Line Items]      
Marketable Securities [1] $ 12,189   $ 90,235
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 1,800    
Proceeds from Sale and Maturity of Marketable Securities $ 71,562 $ 3,780  
Supervalu Inc. [Member]      
Note 8 - Marketable Securities and Other Investments (Details) [Line Items]      
Marketable Securities, Number of Shares Sold (in Shares) 7.7    
Proceeds from Sale and Maturity of Marketable Securities $ 70,300    
Marketable Securities, Realized Gain (Loss) $ 38,500    
[1] As of September 30, 2015 and December 31, 2014, the Company determined that $10.5 million and $87.7 million, respectively, of the Marketable securities estimated fair value were classified within Level 1 of the fair value hierarchy and the remaining $1.7 million and $2.3 million, respectively, were classified within Level 3 of the fair value hierarchy.