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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Gain (Loss) on Securities [Line Items] |  |  |  |
Net changes in unrealized gains (losses) on investments | $ (3,758) | $ 3,132 | $ 1,290 | $ 1,984
Trading Securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) | (2,659) | (1,150) | (6,011) | 9,990
Equity securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Equity Securities, Change in Unrealized Holding Gain (Loss) | (1,086) | 4,455 | 6,251 | (8,158)
Other investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Other Investments, Change in Unrealized Holding Gain (Loss) | $ (13) | $ (173) | $ 1,050 | $ 152

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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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