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Note 6 - Marketable Securities (Details Textual) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 24, 2020 | Jun. 25, 2020 | Oct. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Marketable Securities, Gain (Loss), Total |  |  |  |  |  | $ (76,931) |  | $ (199) |  | $ 444,646 |  | $ 1,375 |  |
Proceeds from Sale of Cost Method Investments |  |  |  |  |  |  |  |  |  | 227,325 |  | 0 |  |
Realized Investment Gains (Losses), Total |  |  |  |  |  | 0 |  | $ 0 |  | 190,832 |  | $ 0 |  |
Marketable Securities, Total |  |  |  |  |  | $ 556,791 |  |  |  | $ 556,791 |  |  |  | $ 9,353
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.10 |  |  |  |  | $ 0.10000 | [1] | $ 0.28000 | [1] | $ 0.38000 | [1] | $ 0.84000 | [1] |
Albertsons Companies, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock |  |  |  | $ 1,680,000 |  |  |  |  |  |  |  |  |  |
Percentage of Ownership to Be Purchased |  |  |  | 17.50% |  |  |  |  |  |  |  |  |  |
Albertsons Companies, Inc [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  | $ 0.10 |  |  |  |  |  |  |  |  |  |  |
Albertsons Companies, Inc [Member] | IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 50.0 |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Price Per Share (in dollars per share) |  | $ 16.00 |  |  |  |  |  |  |  |  |  |  |  |
Albertsons Companies, Inc [Member] | Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  | $ 1,750,000 |  |  |  |  |  |  |  |  |  |
Albertsons Companies, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Ownership in Cost Method Investment |  |  |  | 7.50% |  | 9.29% |  |  |  | 9.29% |  |  |  |
Proceeds from Sale of Cost Method Investments |  | $ 71,400 |  | $ 156,100 |  |  |  |  |  |  |  |  |  |
Realized Investment Gains (Losses), Total |  | $ 59,200 |  | $ 131,600 |  |  |  |  |  |  |  |  |  |
Shares Sold in Cost Method Investments (in shares) |  | 4.7 |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares (in shares) |  |  |  |  |  | 39.8 |  |  |  | 39.8 |  |  |  |
Marketable Securities, Total |  |  |  |  |  | $ 551,800 |  |  |  | $ 551,800 |  |  |  |
Marketable Securities, Unrealized Gain (Loss), Total |  |  |  |  |  |  |  |  |  | 448,200 |  |  |  |
Albertsons Companies, Inc [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Dividends Received |  |  |  |  | $ 4,000 |  |  |  |  |  |  |  |  |
Albertsons Companies, Inc [Member] | Other Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Investments and Securities, at Cost |  |  |  |  |  | $ 140,200 |  |  |  | $ 140,200 |  |  |  |
[1] | As a result of the COVID-19 pandemic and the future economic uncertainties, out of an abundance of caution, the Company’s Board of Directors had temporarily suspended the dividend on its common shares. In September 2020, the Company’s Board of Directors reinstated and declared a quarterly cash dividend of $0.10 per common share, which was paid on September 24, 2020, to shareholders of record on September 10, 2020.

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