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Note 8 - Marketable Securities (Details Textual) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Proceeds from Sale and Maturity of Marketable Securities | $ 292,552 | $ 302,504 | $ 377
Albertsons Companies, Inc [Member] |  |  |
Dividend Income, Equity Securities, Operating | $ 194,100 |  |
Marketable Securities, Cash Dividend Receivable, Per Share (in dollars per share) | $ 0.09 |  |
Sale of Marketable Securities (in shares) | 14.1 | 11.5 |
Proceeds from Sale and Maturity of Marketable Securities | $ 282,300 | $ 301,100 |
Equity Securities, FV-NI, Realized Gain (Loss) | 241,200 | 251,500 |
Equity Securities, Taxes Paid on Capital Gains | $ 60,900 | $ 57,200 |
Investment Owned, Balance, Shares (in shares) | 14.2 |  |

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