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Note 5 - Investments Net Unrealized Gains (Losses) on Investment Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Net changes in unrealized gains (losses) on investment securities | [1] | $ 349 | $ 2,694 | $ (16,268) | $ 10,011
Equity securities |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Equity Securities, Change in Unrealized Holding Gain (Loss) | [1] | 2,971 | 0 | 2,238 | 0
Trading Securities |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) | [1],[2] | $ (2,622) | $ 2,694 | $ (18,506) | $ 10,011
[1] | Related only to securities still held at period end. All amounts shown are included in net gains (losses) on investments and other financial instruments. 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.
[2] | Includes a de minimis amount of net changes in unrealized gains (losses) related to short-term securities.

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- Definition Amount of unrealized holding gain (loss) recognized in the income statement for investments in equity securities and securities classified as trading. + References No definition available. + Details
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- Definition Amount of the change in unrealized holding gain (loss) recognized in the income statement for investments in equity securities. + References No definition available. + Details
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- Definition Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References No definition available. + Details
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