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Note D - Marketable Equity Securities (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Investment Income, Dividend	$ 309,000	$ 352,000
Equity Securities, FV-NI, Unrealized Gain (Loss), Total	1,397,000	$ 4,205,000
Margin Account Borrowings [Member] | Accrued Expenses and Other Liabilities [Member]
Short-Term Debt, Total	$ 866,000		$ 1,214,000

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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