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Note 4 - Marketable Equity Securities (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investment Income, Dividend | $ 1,266,000 | $ 1,309,000 | $ 1,171,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 10,221,000 | 8,587,000 |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | $ 4,967,000 | $ 2,443,000 |
Margin Account Borrowings [Member] |  |  |
Debt, Weighted Average Interest Rate | 0.75% | 2.40% |
Margin Account Borrowings [Member] | Accrued Expenses and Other Liabilities [Member] |  |  |
Short-term Debt, Total | $ 11,251,000 | $ 7,474,000 |

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