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Note D - Marketable Equity Securities (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Investment Income, Dividend	$ 335,000	$ 314,000	$ 995,000	$ 946,000
Equity Securities, FV-NI, Unrealized Gain (Loss), Total	(456,000)	$ (498,000)
Margin Account Borrowings [Member] | Accrued Expenses and Other Liabilities [Member]
Short-term Debt, Total	$ 13,102,000		$ 13,102,000		$ 12,705,000

X

- Definition

Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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