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Note 6 - Marketable Securities (Details Textual) - USD ($) $ in Thousands, shares in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Proceeds from Sale and Maturity of Marketable Securities | $ 291,341 | $ 800 |
Marketable Securities | 327,135 |  | $ 597,732
Dividend Income, Equity Securities, Operating | $ 194,100 |  |
Albertsons Companies, Inc [Member] |  |  |
Sale of Marketable Securities (in shares) | 14.1 |  |
Proceeds from Sale and Maturity of Marketable Securities | $ 282,300 |  |
Equity Securities, FV-NI, Realized Gain (Loss) | 241,200 |  |
Equity Securities, Federal and State Taxes Payable on Capital Gains | $ 61,000 |  |
Investment Owned, Balance, Shares (in shares) | 14.2 |  |
Marketable Securities | $ 323,300 |  |

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