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Note 6 - Investments - Net Changes in Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Gain (Loss) on Securities [Line Items] |  |  |  |
Net changes in unrealized gains (losses) on investments | $ 3,132 | $ 4,742 | $ 1,984 | $ 28,068
Trading Securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) | (1,150) | 4,132 | 9,990 | 18,962
Equity securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Equity Securities, Change in Unrealized Holding Gain (Loss) | 4,455 | 563 | (8,158) | 9,170
Other investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Other Investments, Change in Unrealized Holding Gain (Loss) | $ (173) | $ 47 | $ 152 | $ (64)

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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