Note 6 - Investments Gain (Loss) on Investments (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Gain (Loss) on Investments [Line Items]
Investments	$ 4,947,745,000		$ 4,947,745,000		$ 4,931,157,000
Gain (Loss) on Disposition of Other Assets	(63,000)	(4,000)	(53,000)	23,000
Realized Gain (Loss) on Marketable Securities and Cost Method Investments, Excluding Other than Temporary Impairments, and Other Investments	(483,000)	8,809,000	(4,308,000)	22,617,000
Trading Securities, Change in Unrealized Holding Gain (Loss)	47,447,000	(138,658,000)	115,528,000	(156,441,000)
Unrealized Gain (Loss) on Investments	255,000	(405,000)	450,000	(1,935,000)
Net gains (losses) on investments	47,219,000	(130,254,000)	111,670,000	(135,759,000)
Fixed Maturities [Member]
Gain (Loss) on Investments [Line Items]
Marketable Securities, Realized Gain (Loss), Excluding Other than Temporary Impairments	0	0	(9,000)	2,000
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments	(604,000)	803,000	206,000	869,000
Equity securities
Gain (Loss) on Investments [Line Items]
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments	0	349,000	0	349,000
Trading Securities [Member]
Gain (Loss) on Investments [Line Items]
Trading Securities, Realized Gain (Loss)	184,000	3,183,000	(4,452,000)	13,016,000
Short-term Investments [Member]
Gain (Loss) on Investments [Line Items]
Gain (Loss) on Sale of Securities, Net	0	0	0	2,000
Other investments
Gain (Loss) on Investments [Line Items]
Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments	$ 0	$ 4,478,000	$ 0	$ 8,356,000