Note 5 - Investments Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Gain (Loss) on Investments [Line Items]
Gain (Loss) on Sale of Other Investments	$ 1	$ (63)	$ 106	$ (53)
Realized Gain (Loss) on Marketable Securities and Cost Method Investments, Excluding Other than Temporary Impairments, and Other Investments	60,429	(708)	55,915	(5,053)
Unrealized (losses) gains on trading securities	(31,638)	28,941	(10,937)	76,572
Total net gains on investments	28,791	28,233	44,978	71,519
Net gains (losses) on other financial instruments	(343)	(2,901)	249	(3,219)
Net gains on investments and other financial instruments	28,448	25,332	45,227	68,300
Fixed Maturities [Member]
Gain (Loss) on Investments [Line Items]
Marketable Securities, Realized Gain (Loss), Excluding Other than Temporary Impairments	0	0	0	(9)
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments	(8)	(604)	(59)	(599)
Equity securities
Gain (Loss) on Investments [Line Items]
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments	68,723	0	68,723	0
Trading Securities [Member]
Gain (Loss) on Investments [Line Items]
Trading Securities, Realized Gain (Loss)	(8,291)	(41)	(12,859)	(4,392)
Short-term Investments [Member]
Gain (Loss) on Investments [Line Items]
Gain (Loss) on Sale of Securities, Net	$ 4	$ 0	$ 4	$ 0