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Note 5 - Investments Gain (Loss) on Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Gain (Loss) on Investments [Line Items]        
Gain on Sale of Other Investments $ 0 $ 291 $ 106 $ 238
Realized Gain (Loss) on Marketable Securities and Cost Method Investments, Excluding Other than Temporary Impairments, and Other Investments 2,423 (301) 58,338 (5,354)
Unrealized gains (losses) on trading securities 1,810 (6,007) (9,127) 70,565
Total net gains (losses) on investments 4,233 (6,308) 49,211 65,211
Net (losses) gains on other financial instruments (365) 14 (116) (3,205)
Net gains (losses) on investments and other financial instruments 3,868 (6,294) 49,095 62,006
Fixed Maturities [Member]        
Gain (Loss) on Investments [Line Items]        
Marketable Securities, Realized Loss, Excluding Other than Temporary Impairments 0 0 0 (9)
Available-for-sale Securities, Gross Realized (Loss) Gain, Excluding Other than Temporary Impairments (343) (540) (402) (1,139)
Equity securities        
Gain (Loss) on Investments [Line Items]        
Available-for-sale Securities, Gross Realized (Loss) Gain, Excluding Other than Temporary Impairments 0 0 68,723 0
Trading Securities [Member]        
Gain (Loss) on Investments [Line Items]        
Trading Securities, Realized Loss (1) (52) (12,860) (4,444)
Short-term Investments [Member]        
Gain (Loss) on Investments [Line Items]        
Loss on Sale of Securities, Net (27) 0 (23) 0
Other investments        
Gain (Loss) on Investments [Line Items]        
Cost-method Investments, Realized Gain, Excluding Other than Temporary Impairments $ 2,794 $ 0 $ 2,794 $ 0