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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
--- | --- | --- | --- | ---
Jan. 20, 2023 | Nov. 07, 2022 | Oct. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Proceeds from Sale and Maturity of Marketable Securities |  |  |  | $ 302,504 | $ 377 | $ 931
Marketable Securities, Total |  |  |  | 597,732 | 1,211,739 |
Dividend Income, Operating, Total |  |  |  | $ 18,002 | $ 16,958 | $ 4,096
Albertsons Companies, Inc [Member] |  |  |  |  |  |
Sale of Marketable Securities (in shares) |  |  | 11.5 |  |  |
Proceeds from Sale and Maturity of Marketable Securities |  |  | $ 301,100 |  |  |
Equity Securities, FV-NI, Realized Gain (Loss), Total |  |  | 251,500 |  |  |
Equity Securities, Taxes Paid on Capital Gains |  |  | $ 57,200 |  |  |
Investment Owned, Balance, Shares (in shares) |  |  |  | 28.3 |  |
Marketable Securities, Total |  |  |  | $ 587,700 |  |
Marketable Securities, Cash Dividend Receivable, Per Share (in dollars per share) |  | $ 6.85 |  |  |  |
Albertsons Companies, Inc [Member] | Subsequent Event [Member] |  |  |  |  |  |
Dividend Income, Operating, Total | $ 194,100 |  |  |  |  |

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