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Note D - Marketable Equity Securities (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Investment Income, Dividend	$ 352,000	$ 305,000
Equity Securities, FV-NI, Unrealized Gain (Loss), Total	4,204,000	$ 8,805,000
Margin Account Borrowings [Member] | Accrued Expenses and Other Liabilities [Member]
Short-term Debt, Total	$ 10,675,000		$ 11,251,000

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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