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Note 15 - Accumulated Other Comprehensive Income (Loss) | 3 Months Ended
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Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The following table shows the rollforward of accumulated other comprehensive income (loss) as of the periods indicated.
|  |  |  |  |  |  | Three Months Ended March 31, 2021
(In thousands) |  |  |  |  |  |  | Before Tax |  | Tax Effect |  | Net of Tax
Balance at beginning of period |  |  |  |  |  |  | $ | 333,829 |  |  | $ | 70,104 |  |  | $ | 263,725 |
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized |  |  |  |  |  |  | (186,543) |  |  | (39,174) |  |  | (147,369) |
Less: Reclassification adjustment for net gains (losses) on investments included in net income (loss): (1) |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on disposals and non-credit related impairment losses |  |  |  |  |  |  | (790) |  |  | (166) |  |  | (624) |
Net decrease (increase) in expected credit losses |  |  |  |  |  |  | 310 |  |  | 65 |  |  | 245 |
Other comprehensive income (loss) |  |  |  |  |  |  | (186,063) |  |  | (39,073) |  |  | (146,990) |
Balance at end of period |  |  |  |  |  |  | $ | 147,766 |  |  | $ | 31,031 |  |  | $ | 116,735 |
|  |  |  |  |  |  | Three Months Ended March 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 holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized |  |  |  |  |  |  | (91,511) |  |  | (19,218) |  |  | (72,293) |
Less: Reclassification adjustment for net gains (losses) on investments included in net income (loss): (1) |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on disposals and non-credit related impairment losses |  |  |  |  |  |  | 10,625 |  |  | 2,231 |  |  | 8,394 |
Other comprehensive income (loss) |  |  |  |  |  |  | (102,136) |  |  | (21,449) |  |  | (80,687) |
Balance at end of period |  |  |  |  |  |  | $ | 37,722 |  |  | $ | 7,921 |  |  | $ | 29,801 |
(1)Included in net gains (losses) on investments and other financial instruments on our condensed 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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