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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Other Assets, Total | $ 214,028 |  | $ 214,028 | $ 214,028 |  | $ 345,012
Marketable Securities, Total | 633,551 |  | 633,551 | 633,551 |  | 9,353
Marketable Securities, Gain (Loss), Total | 526,243 | $ 71 |  | $ 521,577 | $ 1,574 |
Revision of Prior Period, Reclassification, Adjustment [Member] |  |  |  |  |  |
Other Assets, Total |  |  |  |  |  | $ (9,400)
Other Income | $ (100) |  | $ (1,600) |  |  |

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