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Note 4 - Marketable Equity Securities (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Investment Income, Dividend | $ 1,557,000 | $ 1,539,000 | $ 1,448,000
Equity Securities, FV-NI, Total | 8,099,000 | 7,875,000 |
Equity Securities, FV-NI, Unrealized Loss | 2,630,000 | $ 2,100,000 |
Margin Account Borrowings [Member] |  |  |
Debt, Weighted Average Interest Rate |  | 4.92% |
Margin Account Borrowings [Member] | Accrued Expenses And Other Liabilities And Other Long-term Liabilities [Member] |  |  |
Short-Term Debt, Total | $ 0 | $ 914,000 |

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