Note 14 - Accumulated Other Comprehensive Income Rollforward of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Comprehensive Income, Net of Tax [Abstract]
AOCI, Net of Tax, beginning balance				$ (12,395)
Unrealized holding gains (losses) arising during the period		$ 20,239	$ 40,297	27,606	$ 79,671
Less: Reclassification adjustment for net gains (losses) included in net income (loss)		(1,167)	758	(2,798)	(1,399)
Net foreign currency translation adjustments		74	(225)	108	(310)
Net actuarial gains (losses)		0	0	0	(178)
Other comprehensive income (loss), net of tax		21,480	39,314	30,512	80,582
AOCI, Net of Tax, ending balance		18,117		18,117
Other Comprehensive Income
Other Comprehensive Income, before Tax [Abstract]
AOCI before Tax, Attributable to Parent, beginning balance		(5,168)	35,064	(19,063)	(28,425)
Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax		31,137	61,996	42,471	122,571
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	[1]	(1,795)	1,166	(4,304)	(2,152)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax		32,932	60,830	46,775	124,723
Net foreign currency translation adjustments, before tax		114	(346)	166	(476)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax			0		(274)
Other comprehensive income, before tax		33,046	60,484	46,941	123,973
AOCI before Tax, Attributable to Parent, ending balance		27,878	95,548	27,878	95,548
Other Comprehensive Income, Tax [Abstract]
AOCI, Tax, beginning balance		(1,805)	12,273	(6,668)	(9,948)
Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax		10,898	21,699	14,865	42,900
Less: Reclassification adjustment for net (losses) gains included in net income, tax	[1]	(628)	408	(1,506)	(753)
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax		11,526	21,291	16,371	43,653
Net foreign currency translation adjustments, tax		40	(121)	58	(166)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax			0		(96)
Other Comprehensive Income, Tax		11,566	21,170	16,429	43,391
AOCI Tax, ending balance		9,761	33,443	9,761	33,443
Other Comprehensive Income, Net of Tax [Abstract]
AOCI, Net of Tax, beginning balance		(3,363)	22,791	(12,395)	(18,477)
Unrealized holding gains (losses) arising during the period		20,239	40,297	27,606	79,671
Less: Reclassification adjustment for net gains (losses) included in net income (loss)	[1]	(1,167)	758	(2,798)	(1,399)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent		21,406	39,539	30,404	81,070
Net foreign currency translation adjustments		74	(225)	108	(310)
Net actuarial gains (losses)			0		(178)
Other comprehensive income (loss), net of tax		21,480	39,314	30,512	80,582
AOCI, Net of Tax, ending balance		$ 18,117	$ 62,105	$ 18,117	$ 62,105

[1] Included in net gains (losses) on investments and other financial instruments on our consolidated statements of operations.