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Note D - Marketable Equity Securities (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Investment Income, Dividend	$ 428,000	$ 335,000	$ 1,095,000	$ 995,000
Equity Securities, FV-NI, Unrealized Gain (Loss), Total	(2,387,000)	$ (456,000)
Margin Account Borrowings [Member] | Accrued Expenses and Other Liabilities [Member]
Short-Term Debt, Total	$ 1,035,000		$ 1,035,000		$ 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).

+ References

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Amount of dividend income on nonoperating securities.

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