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Note D - Marketable Equity Securities (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Dec. 31, 2024
Investment Income, Dividend	$ 316,000		$ 1,150,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	1,392,000	$ 2,365,000
Margin Account Borrowings [Member] | Accrued Expenses And Other Liabilities And Other Long-term Liabilities [Member]
Short-Term Debt	$ 0		$ 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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