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Note 14 - Accumulated Other Comprehensive Income (Loss) Rollforward of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Other Comprehensive Income, before Tax [Abstract] |  |  |  |  |  |  |
Unrealized foreign currency translation adjustments |  |  | $ (4) |  |  | $ (4) |
Other Comprehensive Income, Tax [Abstract] |  |  |  |  |  |  |
Unrealized foreign currency translation adjustments |  |  | (1) |  |  | (1) |
Other Comprehensive Income, Net of Tax [Abstract] |  |  |  |  |  |  |
AOCI, Net of Tax, Balance at beginning of period |  |  |  |  | $ 110,488 |  |
Unrealized holding gains (losses) arising during the period for which an allowance for expected credit losses has not been recognized |  | $ 185,056 | 72,000 |  | 112,763 | 150,023 |
Net realized gains (losses) on disposals and non-credit related impairment losses |  | 4,894 | 1,029 |  | 13,288 | 638 |
Net decrease (increase) in expected credit losses |  | (2,198) | 0 |  | (2,198) | 0 |
Unrealized foreign currency translation adjustments |  | 0 | (3) |  | 0 | (3) |
Other comprehensive income (loss), net of tax |  | 182,360 | 70,968 |  | 101,673 | 149,382 |
AOCI, Net of Tax, Balance at end of period |  | 212,161 |  |  | 212,161 |  |
Other Comprehensive Income |  |  |  |  |  |  |
Other Comprehensive Income, before Tax [Abstract] |  |  |  |  |  |  |
AOCI before Tax, Balance at beginning of period |  | 37,722 | 22,144 |  | 139,858 | (77,114) |
Unrealized holding gains (losses) arising during the period for which an allowance for expected credit losses has not been recognized |  | 234,249 | 91,140 |  | 142,738 | 189,903 |
Net realized gains (losses) on disposals and non-credit related impairment losses | [1] | 6,195 |  |  | 16,820 |  |
Net decrease (increase) in expected credit losses | [1] | (2,782) | 1,303 |  | (2,782) | 808 |
Net unrealized gains (losses) on investments |  | 230,836 | 89,837 | [1] | 128,700 | 189,095 | [1]
Other comprehensive income (loss) |  | 230,836 | 89,833 |  | 128,700 | 189,091 |
AOCI before Tax, Balance at end of period |  | 268,558 | 111,977 |  | 268,558 | 111,977 |
Other Comprehensive Income, Tax [Abstract] |  |  |  |  |  |  |
AOCI, Tax, Balance at beginning of period |  | 7,921 | 4,650 |  | 29,370 | (16,194) |
Unrealized holding gains (losses) arising during the period for which an allowance for expected credit losses has not been recognized |  | 49,193 | 19,140 |  | 29,975 | 39,880 |
Net realized gains (losses) on disposals and non-credit related impairment losses | [1] | 1,301 |  |  | 3,532 |  |
Net decrease (increase) in expected credit losses | [1] | (584) | 274 |  | (584) | 170 |
Net unrealized gains (losses) on investments |  | 48,476 | 18,866 | [1] | 27,027 | 39,710 | [1]
Other comprehensive income (loss) |  | 48,476 | 18,865 |  | 27,027 | 39,709 |
AOCI Tax, Balance at end of period |  | 56,397 | 23,515 |  | 56,397 | 23,515 |
Other Comprehensive Income, Net of Tax [Abstract] |  |  |  |  |  |  |
AOCI, Net of Tax, Balance at beginning of period |  | 29,801 | 17,494 |  | 110,488 | (60,920) |
Unrealized holding gains (losses) arising during the period for which an allowance for expected credit losses has not been recognized |  | 185,056 | 72,000 |  | 112,763 | 150,023 |
Net realized gains (losses) on disposals and non-credit related impairment losses | [1] | 4,894 |  |  | 13,288 |  |
Net decrease (increase) in expected credit losses | [1] | (2,198) | 1,029 |  | (2,198) | 638 |
Net unrealized gains (losses) on investments |  | 182,360 | 70,971 | [1] | 101,673 | 149,385 | [1]
Other comprehensive income (loss), net of tax |  | 182,360 | 70,968 |  | 101,673 | 149,382 |
AOCI, Net of Tax, Balance at end of period |  | $ 212,161 | $ 88,462 |  | $ 212,161 | $ 88,462 |
[1] | Included in net gains (losses) on investments and other financial instruments on our condensed consolidated statements of operations.

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 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=118930883&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580 + Details
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