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Note 5 - Investments Gain (Loss) on Investments (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) security | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) security | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) security
Gain (Loss) on Investments [Line Items] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 311 |  | 311 |  | 362
Other gains | $ 0 | $ 0 | $ 18 | $ 18 |
Net realized losses on investments | (1,182) | 1,587 | (9,361) | (3,992) |
Other than Temporary Impairment Losses, Investments | (1,000) | 0 | (1,000) | 0 |
Unrealized gains on trading securities | 6,938 | 27,678 | 12,164 | 62,909 |
Total net gains on investments | 4,756 | 29,265 | 1,803 | 58,917 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 1,139,971 |  | 1,139,971 |  | $ 1,566,440
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 13,490 |  | $ 13,490 |  | $ 37,941
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 5 |  | 5 |  | 21
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 11,303 |  | $ 11,303 |  | $ 58,451
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 180 |  | $ 180 |  | $ 842
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 316 |  | 316 |  | 383
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 1,151,274 |  | $ 1,151,274 |  | $ 1,624,891
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 13,670 |  | 13,670 |  | $ 38,783
Net gains (losses) on other financial instruments | 575 | 1,262 | 677 | 2,896 |
Net Gains (Losses) on Investments and Other Financial Instruments | 5,331 | 30,527 | 2,480 | 61,813 |
Fixed Maturities [Member] |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |
Available-for-sale Securities, Gross Realized (Loss) Gain, Excluding Other than Temporary Impairments | (1,180) | 1,166 | (3,689) | (1,982) |
Equity securities |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |
Available-for-sale Securities, Gross Realized (Loss) Gain, Excluding Other than Temporary Impairments | 385 | 0 | 385 | (170) |
Trading Securities [Member] |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |
Trading securities | (349) | 421 | (6,043) | (1,819) |
Short-term Investments [Member] |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |
Short-term investments | $ (38) | $ 0 | $ (32) | $ (39) |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 10 |  | 10 |  | 7
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 47,282 |  | $ 47,282 |  | $ 30,901
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 340 |  | $ 340 |  | $ 821
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 0 |  | 0 |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 0 |  | $ 0 |  | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 0 |  | $ 0 |  | $ 0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 10 |  | 10 |  | 7
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 47,282 |  | $ 47,282 |  | $ 30,901
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 340 |  | $ 340 |  | $ 821

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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 + Details
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