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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Other Assets, Total | $ 218,724 |  | $ 218,724 | $ 218,724 |  | $ 345,012
Marketable Securities, Total | 556,791 |  | 556,791 | 556,791 |  | 9,353
Marketable Securities, Gain (Loss), Total | (76,931) | $ (199) |  | $ 444,646 | $ 1,375 |
Revision of Prior Period, Reclassification, Adjustment [Member] |  |  |  |  |  |
Other Assets, Total |  |  |  |  |  | $ (9,400)
Other Income | $ (200) |  | $ (1,400) |  |  |

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