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Note 9 - Marketable Securities (Details Textual) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 25, 2020 | Oct. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Marketable Securities, Gain (Loss), Total |  |  |  | $ 594,753 | $ 829 | $ (3,487)
Proceeds from Sale of Cost Method Investments |  |  |  | 227,270 | 0 | 0
Realized Investment Gains (Losses), Total |  |  |  | 190,832 | 0 | $ 0
Marketable Securities, Total |  |  |  | $ 706,954 | $ 9,353 |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  |  | $ 0.54000 | $ 1.12000 | $ 1.12000
Albertsons Companies, Inc [Member] |  |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock |  |  | $ 1,680,000 |  |  |
Percentage of Ownership to Be Purchased |  |  | 17.50% |  |  |
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% |  |
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 |  |
Marketable Securities, Total |  |  |  | $ 700,400 |  |
Marketable Securities, Unrealized Gain (Loss), Total |  |  |  | 596,800 |  |
Proceeds from Dividends Received |  |  |  | 4,000 |  |
Albertsons Companies, Inc [Member] | Other Assets [Member] |  |  |  |  |  |
Other Investments and Securities, at Cost |  |  |  | $ 140,200 |  |

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