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Note 15 - Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2021
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.
Rollforward of accumulated other comprehensive income
|  | Three Months Ended September 30, 2021 |  | Nine Months Ended September 30, 2021
(In thousands) |  | Before Tax |  | Tax Effect |  | Net of Tax |  | Before Tax |  | Tax Effect |  | Net of Tax
Balance at beginning of period |  | $ | 226,400 |  |  | $ | 47,544 |  |  | $ | 178,856 |  |  | $ | 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 |  | (29,613) |  |  | (6,219) |  |  | (23,394) |  |  | (134,539) |  |  | (28,253) |  |  | (106,286) |
Less: Reclassification adjustment for net gains (losses) on investments included in net income (1) |  |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on disposals and non-credit related impairment losses |  | 4,099 |  |  | 861 |  |  | 3,238 |  |  | 5,684 |  |  | 1,194 |  |  | 4,490 |
Net decrease (increase) in expected credit losses |  | — |  |  | — |  |  | — |  |  | 918 |  |  | 193 |  |  | 725 |
Other comprehensive income (loss) |  | (33,712) |  |  | (7,080) |  |  | (26,632) |  |  | (141,141) |  |  | (29,640) |  |  | (111,501) |
Balance at end of period |  | $ | 192,688 |  |  | $ | 40,464 |  |  | $ | 152,224 |  |  | $ | 192,688 |  |  | $ | 40,464 |  |  | $ | 152,224 |
|  | Three Months Ended September 30, 2020 |  | Nine Months Ended September 30, 2020
(In thousands) |  | Before Tax |  | Tax Effect |  | Net of Tax |  | Before Tax |  | Tax Effect |  | Net of Tax
Balance at beginning of period |  | $ | 268,558 |  |  | $ | 56,397 |  |  | $ | 212,161 |  |  | $ | 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 |  | 39,037 |  |  | 8,198 |  |  | 30,839 |  |  | 181,775 |  |  | 38,173 |  |  | 143,602 |
Less: Reclassification adjustment for net gains (losses) on investments included in net income (1) |  |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on disposals and non-credit related impairment losses |  | 13,777 |  |  | 2,893 |  |  | 10,884 |  |  | 30,597 |  |  | 6,425 |  |  | 24,172 |
Net decrease (increase) in expected credit losses |  | 186 |  |  | 39 |  |  | 147 |  |  | (2,596) |  |  | (545) |  |  | (2,051) |
Other comprehensive income (loss) |  | 25,074 |  |  | 5,266 |  |  | 19,808 |  |  | 153,774 |  |  | 32,293 |  |  | 121,481 |
Balance at end of period |  | $ | 293,632 |  |  | $ | 61,663 |  |  | $ | 231,969 |  |  | $ | 293,632 |  |  | $ | 61,663 |  |  | $ | 231,969 |
(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=124509347&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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