Note 14 - Accumulated Other Comprehensive Income Rollforward of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Other Comprehensive Income, Net of Tax [Abstract]
AOCI, Net of Tax, beginning balance		$ (12,395)
Unrealized holding gains (losses) arising during the period		7,367	$ 39,374
Less: Reclassification adjustment for net gains (losses) included in net income		(1,631)	(2,157)
Net foreign currency translation adjustments		34	(85)
Net actuarial gains (losses)		0	(178)
Other comprehensive income		9,032	41,268
AOCI, Net of Tax, ending balance		(3,363)
Other Comprehensive Income
Other Comprehensive Income, before Tax [Abstract]
AOCI before Tax, Attributable to Parent, beginning balance		(19,063)	(28,425)
Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax		11,334	60,575
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	[1]	(2,509)	(3,318)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax		13,843	63,893
Net foreign currency translation adjustments, before tax		52	(130)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax			(274)
Other comprehensive income, before tax		13,895	63,489
AOCI before Tax, Attributable to Parent, ending balance		(5,168)	35,064
Other Comprehensive Income, Tax [Abstract]
AOCI, Tax, beginning balance		(6,668)	(9,948)
Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax		3,967	21,201
Less: Reclassification adjustment for net (losses) gains included in net income, tax	[1]	(878)	(1,161)
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax		4,845	22,362
Net foreign currency translation adjustments, tax		18	(45)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax			(96)
Other Comprehensive Income, Tax		4,863	22,221
AOCI Tax, ending balance		(1,805)	12,273
Other Comprehensive Income, Net of Tax [Abstract]
AOCI, Net of Tax, beginning balance		(12,395)	(18,477)
Unrealized holding gains (losses) arising during the period		7,367	39,374
Less: Reclassification adjustment for net gains (losses) included in net income	[1]	(1,631)	(2,157)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent		8,998	41,531
Net foreign currency translation adjustments		34	(85)
Net actuarial gains (losses)			(178)
Other comprehensive income		9,032	41,268
AOCI, Net of Tax, ending balance		$ (3,363)	$ 22,791

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