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Note D - Marketable Equity Securities (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Investment Income, Dividend | $ 314,000 | $ 348,000 | $ 946,000 | $ 931,000 |
Equity Securities, FV-NI, Unrealized Gain (Loss), Total | 498,000 | $ 133,000 |  |  |
Margin Account Borrowings [Member] | Accrued Expenses and Other Liabilities [Member] |  |  |  |  |
Short-term Debt, Total | $ 12,705,000 |  | $ 12,705,000 |  | $ 7,474,000

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