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Note 7 - Marketable Securities and Restricted Marketable Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Equity Securities [Member]    
Investments available for sale:    
Marketable equity securities $ 30,176 $ 30,176
Marketable equity securities 110,567 132,535
Total investments available for sale 110,567 132,535
Corporate Debt Securities [Member]    
Investments available for sale:    
Amortized Cost 69,347 68,594
Fair Value 69,052 68,916
Total investments available for sale 69,052 68,916
Commercial Mortgage Backed Securities [Member]    
Investments available for sale:    
Amortized Cost 62,689 63,351
Fair Value 62,735 63,252
Total investments available for sale 62,735 63,252
US Government Corporations and Agencies Securities [Member]    
Investments available for sale:    
Amortized Cost 19,939 14,623
Fair Value 20,107 14,728
US States and Political Subdivisions Debt Securities [Member]    
Investments available for sale:    
Amortized Cost 16,508 11,074
Fair Value 16,930 11,377
Total investments available for sale 16,930 11,377
Amortized Cost 168,483 157,642
Total amortized cost 198,659 187,818
Total investments available for sale $ 279,391 $ 290,808