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Note 5 - Investments Gain (Loss) on Investments (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) security | Mar. 31, 2017 USD ($) | Dec. 31, 2017 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 |  | 612 |  | 332
Other gains |  | $ 12 | $ 18 |
Net realized losses on investments |  | (3,442) | (8,179) |
Other than Temporary Impairment Losses, Investments |  |  | 0 |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net |  | 844 |  | $ (1,400)
Unrealized gains on trading securities | [1] |  | 5,226 |
Other Securities, Change in Unrealized Holding Gain (Loss) | [1] | (12,804) |  |
Total net gains on investments |  | (17,090) | (2,953) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 2,417,708 |  | 1,338,867
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | $ 46,167 |  | $ 9,827
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security |  | 68 |  | 72
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | $ 223,335 |  | $ 262,531
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | $ 11,699 |  | $ 6,607
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  | 680 |  | 404
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | $ 2,641,043 |  | $ 1,601,398
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 57,866 |  | $ 16,434
Net gains (losses) on other financial instruments |  | (1,797) | 102 |
Net Gains (Losses) on Investments and Other Financial Instruments |  | (18,887) | (2,851) |
Fixed Maturities [Member] |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
Available-for-sale Securities, Gross Realized (Loss) Gain, Excluding Other than Temporary Impairments |  | (3,120) | (2,509) |
Equity securities |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
Equity Securities, Realized Gain (Loss) |  | 142 | 0 |
Trading Securities [Member] |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
Trading securities |  | (538) | (5,694) |
Short-term Investments [Member] |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
Short-term investments |  | 0 | 6 |
Other investments |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments |  | $ 62 | $ 0 |
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 |  | 28 |  | 21
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 79,897 |  | $ 65,898
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | $ 1,729 |  | $ 699
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security |  | 0 |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | $ 0 |  | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | $ 0 |  | $ 0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  | 28 |  | 21
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | $ 79,897 |  | $ 65,898
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ 1,729 |  | $ 699
[1] | These amounts include unrealized gains (losses) on investment securities other than securities available for sale. For the three months ended March 31, 2017, the amount excludes the net change in unrealized gains and losses on equity securities. Prior to the implementation of the update to the standard for the accounting of financial instruments effective January 1, 2018, the unrealized losses associated with equity securities were classified in accumulated other comprehensive income.

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26805-111562 + Details
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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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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition This item represents the net total realized 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 or loss of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain or 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/or investments that are separately or otherwise not categorized as trading, available-for-sale, or held-to-maturity. + References No definition available. + Details
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