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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 | Jun. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Marketable Securities, Gain (Loss), Total |  |  | $ 505,163 | $ 594,753 | $ 829
Investment Income, Dividend |  |  | 17,000 | 4,100 |
Proceeds from Sale of Cost Method Investments |  |  | 0 | 227,270 | 0
Realized Investment Gains (Losses), Total |  |  | 0 | 190,832 | $ 0
Marketable Securities, Total |  |  | $ 1,211,739 | 706,954 |
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] | 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 |  |  | $ 1,200,000 | 700,400 |
Marketable Securities, Unrealized Gain (Loss), Total |  |  | 1,100,000 | $ 596,800 |
Albertsons Companies, Inc [Member] | Other Assets [Member] |  |  |  |  |
Other Investments and Securities, at Cost |  |  | $ 140,200 |  |

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