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Note 15 - Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2019
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, 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 | 98,763 |  |  | 20,740 |  |  | 78,023 |
Less: Reclassification adjustment for net gains (losses) included in net income (1) | (495 | ) |  | (104 | ) |  | (391 | )
Net unrealized gains (losses) on investments | 99,258 |  |  | 20,844 |  |  | 78,414 |
Other comprehensive income (loss) | 99,258 |  |  | 20,844 |  |  | 78,414 |
Balance at end of period | $ | 22,144 |  |  | $ | 4,650 |  |  | $ | 17,494 |
| Three Months Ended March 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 the accounting standard update for financial instruments | 284 |  |  | 60 |  |  | 224 |
Cumulative effect of adopting the accounting standard update for the reclassification of certain tax effects | — |  |  | (2,724 | ) |  | 2,724 |
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 | (76,763 | ) |  | (16,120 | ) |  | (60,643 | )
Less: Reclassification adjustment for net gains (losses) included in net income (1) | (3,964 | ) |  | (832 | ) |  | (3,132 | )
Net unrealized gains (losses) on investments | (72,799 | ) |  | (15,288 | ) |  | (57,511 | )
Unrealized foreign currency translation adjustments | 4 |  |  | 1 |  |  | 3 |
Other comprehensive income (loss) | (72,795 | ) |  | (15,287 | ) |  | (57,508 | )
Balance at end of period | $ | (39,842 | ) |  | $ | (8,367 | ) |  | $ | (31,475 | )
______________________ (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://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=114867106&loc=SL7669686-108580 + Details
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