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Note 5 - Investments Gain (Loss) on Investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Gain (Loss) on Investments [Line Items]    
Other gains $ 18 $ 105
Net realized losses on investments (5,579) (4,514)
Unrealized gains on trading securities 35,231 20,701
Total net gains on investments 29,652 16,187
Net gains on other financial instruments 1,634 592
Net gains on investments and other financial instruments 31,286 16,779
Fixed Maturities [Member]    
Gain (Loss) on Investments [Line Items]    
Available-for-sale Securities, Gross Realized (Loss) Gain, Excluding Other than Temporary Impairments (3,148) (51)
Equity securities    
Gain (Loss) on Investments [Line Items]    
Available-for-sale Securities, Gross Realized (Loss) Gain, Excluding Other than Temporary Impairments (170) 0
Trading Securities [Member]    
Gain (Loss) on Investments [Line Items]    
Trading securities (2,240) (4,568)
Short-term Investments [Member]    
Gain (Loss) on Investments [Line Items]    
Short-term investments $ (39) $ 0