Note 11 - Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss), before Tax	$ 44,665		$ 26,294		$ 44,665		$ 26,294		$ 37,450	$ 24,904	$ 22,682	$ 12,039
Accumulated Other Comprehensive Income (Loss), before Tax [Abstract] [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax			1				(11)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax			0				0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax			1				(11)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	7,659		(2,489)		21,422		21,811
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	444	[1]	(6,100)	[1]	1,661	[1]	7,545	[1]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax	7,215		3,611		19,761		14,266
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	7,215		3,612		19,761		14,255
Accumulated Other Comprehensive Income (Loss), Tax [Abstract]
Accumulated Other Comprehensive Income, Tax	12,984		4,364		8,809		639
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax			0				(4)
Other Comprehensive Income (Loss), Foreign Currency Translation Reclassification Adjustment Realized upon Sale or Liquidation, Tax			0				0
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax			0				(4)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	2,681		(871)		7,498		7,634
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Tax	140	[1]	(4,911)	[1]	782	[1]	(135)	[1]
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	2,541		4,040		6,716		7,769
Other Comprehensive Income (Loss), Tax	2,541		4,040		6,716		7,765
Accumulated Other Comprehensive Income, Tax	15,525		8,404		15,525		8,404
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive income, net of tax	24,466		18,318		16,095		11,400
Unrealized foreign currency translation adjustment, net of tax	0		1		0		(7)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax	0		0		0		0
Net foreign currency translation adjustment, net of tax	0		1		0		(7)
Unrealized holding gains (losses) arising during the period, net of tax	4,978		(1,618)		13,924		14,177
Less: Reclassification adjustment for net gains (losses) included in net (loss) income, net of tax	304	[1]	(1,189)	[1]	879	[1]	7,680	[1]
Net unrealized gains (losses) on investments, net of tax	4,674		(429)		13,045		6,497
Other comprehensive income (loss)	4,674		(428)		13,045		6,490
Accumulated other comprehensive income, net of tax	$ 29,140		$ 17,890		$ 29,140		$ 17,890

[1] Included in net (losses) gains on investments on our condensed consolidated statements of operations.