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Note D - Marketable Equity Securities (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Investment Income, Dividend	$ 349,000	$ 377,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	2,586,000	$ 288,000
Margin Account Borrowings [Member] | Accrued Expenses And Other Liabilities And Other Long-term Liabilities [Member]
Short-Term Debt	$ 0		$ 0

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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- Definition

Amount of dividend income on nonoperating securities.

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