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Note 15 - Accumulated Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2018
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, 2018
(In thousands) | Before Tax |  | Tax Effect |  | Net of Tax
Balance at beginning of period | $ | 32,669 |  |  | $ | 9,584 |  |  | $ | 23,085 |
OCI: |  |  |  |  |
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 |
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 |
OCI | (72,511 | ) |  | (17,951 | ) |  | (54,560 | )
Balance at end of period | $ | (39,842 | ) |  | $ | (8,367 | ) |  | $ | (31,475 | )
| Three Months Ended March 31, 2017
(In thousands) | Before Tax |  | Tax Effect |  | Net of Tax
Balance at beginning of period | $ | (19,063 | ) |  | $ | (6,668 | ) |  | $ | (12,395 | )
OCI: |  |  |  |  |
Unrealized gains (losses) on investments: |  |  |  |  |
Unrealized holding gains (losses) arising during the period | 11,334 |  |  | 3,967 |  |  | 7,367 |
Less: Reclassification adjustment for net gains (losses) included in net income (1) | (2,509 | ) |  | (878 | ) |  | (1,631 | )
Net unrealized gains (losses) on investments | 13,843 |  |  | 4,845 |  |  | 8,998 |
Unrealized foreign currency translation adjustments | 52 |  |  | 18 |  |  | 34 |
OCI | 13,895 |  |  | 4,863 |  |  | 9,032 |
Balance at end of period | $ | (5,168 | ) |  | $ | (1,805 | ) |  | $ | (3,363 | )
______________________
(1) | Included in net gains (losses) on investments and other financial instruments on 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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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