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Note 5 - Investments Net Unrealized Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Gain (Loss) on Investments [Line Items] |  |  |  |  |
Unrealized Gain (Loss) on Securities | [1] | $ (5,577) | $ 5,913 | $ (17,503) | $ 7,979
Trading Securities, Change in Unrealized Holding Gain (Loss) | [2] | (5,733) | 6,938 | (18,537) | 12,164
Equity Securities [Member] |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |
Equity Securities, Change in Unrealized Holding Gain (Loss) | [1] | 224 | 0 | (702) | 0
Trading Securities [Member] |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) | [1],[3] | $ (5,801) | $ 5,913 | $ (16,801) | $ 7,979
[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] | These amounts include unrealized gains (losses) on investment securities other than securities available for sale. For the three and six months ended June 30, 2017, the unrealized gains (losses) on investments exclude 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 gains (losses) associated with equity securities were classified in accumulated other comprehensive income.
[3] | 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 debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: 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)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82895926&loc=d3e24584-111560 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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