Note 17 - Accumulated Other Comprehensive Income (Loss) Rollforward of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at beginning of period, net of tax		$ (60,920)
Unrealized holding gains (losses) arising during the period, net of tax		180,441	$ (97,356)	$ 31,903
Less: Reclassification adjustment for net gains (losses) included in net income, net of tax		8,897	(10,270)	(2,642)
Net unrealized gains (losses) on investments, net of tax		171,544	(87,086)	34,545
Unrealized foreign currency translation adjustments, net of tax		0	5	150
Less: Reclassification adjustment for liquidation of foreign subsidiary and other adjustments included in net income, net of tax		3	1	(721)
Net foreign currency translation adjustments		(3)	4	871
Net actuarial gains (losses), net of tax		(133)	129	64
OCI, net of tax		171,408	(86,953)	35,480
Balance at end of period, net of tax		110,488	(60,920)
Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss), before Tax [Abstract]
Balance at beginning of period, before tax		(77,114)	32,669	(19,063)
Cumulative effect of adopting the accounting standard update, before tax			284
Balance adjusted for cumulative effect of adopting accounting standard updates, before tax			32,953
Unrealized holding gains (losses) arising during the period, before tax		228,406	(123,235)	46,235
Less: Reclassification adjustment for net gains (losses) included in net income, before tax	[1]	11,262	(13,000)	(4,065)
Net unrealized gains (losses) on investments		217,144	(110,235)	50,300
Unrealized foreign currency translation adjustments, before tax		0	5	225
Less: Reclassification adjustment for liquidation of foreign subsidiary and other adjustments included in net income, before tax	[2]	4	0	(1,109)
Net foreign currency translation adjustments, before tax		(4)	5	1,334
Net actuarial gain (loss), before tax		(168)	163	98
OCI, before tax		216,972	(110,067)	51,732
Balance at end of period, before tax		139,858	(77,114)	32,669
Other Comprehensive Income (Loss), Tax [Abstract]
Balance at beginning of period, tax		(16,194)	9,584	(6,668)
Cumulative effect of adopting the accounting standard update, tax			(2,664)
Balance adjusted for cumulative effect of adopting accounting standard updates, tax			6,920
Unrealized holding gains (losses) arising during the period, tax		47,965	(25,879)	14,332
Less: Reclassification adjustment for net gains (losses) included in net income, tax	[1]	2,365	(2,730)	(1,423)
Net unrealized gains (losses) on investments, tax		45,600	(23,149)	15,755
Unrealized foreign currency translation adjustments, tax		0	1	75
Less: Reclassification adjustment for liquidation of foreign subsidiary and other adjustments included in net income, tax	[2]	1	0	(388)
Net foreign currency translation adjustments, tax		(1)	1	463
Net actuarial gains (losses), tax		(35)	34	34
OCI, tax		45,564	(23,114)	16,252
Balance at end of period, tax		29,370	(16,194)	9,584
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at beginning of period, net of tax		(60,920)	23,085	(12,395)
Cumulative effect of adopting the accounting standard update for financial instruments, net of tax			2,948
Balance adjusted for cumulative effect of adopting accounting standard updates, net of tax			26,033
Unrealized holding gains (losses) arising during the period, net of tax		180,441	(97,356)	31,903
Less: Reclassification adjustment for net gains (losses) included in net income, net of tax	[1]	8,897	(10,270)	(2,642)
Net unrealized gains (losses) on investments, net of tax		171,544	(87,086)	34,545
Unrealized foreign currency translation adjustments, net of tax		0	4	150
Less: Reclassification adjustment for liquidation of foreign subsidiary and other adjustments included in net income, net of tax	[2]	3	0	(721)
Net foreign currency translation adjustments		(3)	4	871
Net actuarial gains (losses), net of tax		(133)	129	64
OCI, net of tax		171,408	(86,953)	35,480
Balance at end of period, net of tax		$ 110,488	$ (60,920)	$ 23,085

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

[2] Included in restructuring and other exit costs in our consolidated statements of operations.