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Note 5 - Investments Net Unrealized Gains (Losses) on Investment Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Gain (Loss) on Securities [Line Items] |  |  |  |
Net changes in unrealized gains (losses) on investments | $ 24,032 | $ 9,150 | $ (1,010) | $ 23,634
Trading Securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) | 13,790 | 7,608 | 11,131 | 15,027
Equity securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Equity Securities, Change in Unrealized Holding Gain (Loss) | 10,443 | 1,404 | (12,612) | 8,600
Other investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Other Investments, Change in Unrealized Holding Gain (Loss) | $ (201) | $ 138 | $ 471 | $ 7

X
- 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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