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Note 6 - Investments - Net Changes in Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Gain (Loss) on Securities [Line Items] |  |  |  |
Net changes in unrealized gains (losses) on investments | $ 9,919 | $ 24,032 | $ 7,597 | $ (1,010)
Trading Securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) | 4,601 | 13,790 | (3,448) | 11,131
Equity securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Equity Securities, Change in Unrealized Holding Gain (Loss) | 5,140 | 10,443 | 9,983 | (12,612)
Other investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Other Investments, Change in Unrealized Holding Gain (Loss) | $ 178 | $ (201) | $ 1,062 | $ 471

X
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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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