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Note 15 - Accumulated Other Comprehensive Income (Loss) - Level 3 | 12 Months Ended
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Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The following tables show the rollforward of accumulated other comprehensive income (loss) as of the periods indicated.
|  | Year Ended December 31, 2020
(In thousands) |  | Before Tax |  | Tax Effect |  | Net of Tax
Balance at beginning of period |  | $ | 139,858 |  |  | $ | 29,370 |  |  | $ | 110,488 |
Other comprehensive income (loss): |  |  |  |  |  |
Unrealized gains (losses) on investments: |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period for which an allowance for expected credit losses has not been recognized |  | 226,280 |  |  | 47,519 |  |  | 178,761 |
Less: Reclassification adjustment for net gains (losses) included in net income (loss): (1) |  |  |  |  |  |
Net realized gains (losses) on disposals and non-credit related impairment losses |  | 33,468 |  |  | 7,028 |  |  | 26,440 |
Net decrease (increase) in expected credit losses |  | (1,254) |  |  | (263) |  |  | (991) |
Net unrealized gains (losses) on investments |  | 194,066 |  |  | 40,754 |  |  | 153,312 |
Other adjustments to comprehensive income, net |  | (95) |  |  | (20) |  |  | (75) |
Other comprehensive income (loss) |  | 193,971 |  |  | 40,734 |  |  | 153,237 |
Balance at end of period |  | $ | 333,829 |  |  | $ | 70,104 |  |  | $ | 263,725 |
|  | Year Ended December 31, 2019
(In thousands) |  | Before Tax |  | Tax Effect |  | Net of Tax
Balance at beginning of period |  | $ | (77,114) |  |  | $ | (16,194) |  |  | $ | (60,920) |
Other comprehensive income (loss): |  |  |  |  |  |
Unrealized gains (losses) on investments: |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period |  | 228,406 |  |  | 47,965 |  |  | 180,441 |
Less: Reclassification adjustment for net gains (losses) included in net income (1) |  | 11,262 |  |  | 2,365 |  |  | 8,897 |
Net unrealized gains (losses) on investments |  | 217,144 |  |  | 45,600 |  |  | 171,544 |
Other adjustments to comprehensive income, net |  | (172) |  |  | (36) |  |  | (136) |
Other comprehensive income (loss) |  | 216,972 |  |  | 45,564 |  |  | 171,408 |
Balance at end of period |  | $ | 139,858 |  |  | $ | 29,370 |  |  | $ | 110,488 |
|  | Year Ended December 31, 2018
(In thousands) |  | Before Tax |  | Tax Effect |  | Net of Tax
Balance at beginning of period |  | $ | 32,669 |  |  | $ | 9,584 |  |  | $ | 23,085 |
Cumulative effect of adopting accounting standard updates |  | 284 |  |  | (2,664) |  |  | 2,948 |
Balance adjusted for cumulative effect of adopting accounting standard updates |  | 32,953 |  |  | 6,920 |  |  | 26,033 |
Other comprehensive income (loss): |  |  |  |  |  |
Unrealized gains (losses) on investments: |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period |  | (123,235) |  |  | (25,879) |  |  | (97,356) |
Less: Reclassification adjustment for net gains (losses) included in net income (1) |  | (13,000) |  |  | (2,730) |  |  | (10,270) |
Net unrealized gains (losses) on investments |  | (110,235) |  |  | (23,149) |  |  | (87,086) |
Other adjustments to comprehensive income, net |  | 168 |  |  | 35 |  |  | 133 |
Other comprehensive income (loss) |  | (110,067) |  |  | (23,114) |  |  | (86,953) |
Balance at end of period |  | $ | (77,114) |  |  | $ | (16,194) |  |  | $ | (60,920) |
(1)Included in net gains (losses) on investments and other financial instruments in our consolidated statements of operations.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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