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Note D - Marketable Equity Securities (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Investment Income, Dividend	$ 309,000	$ 326,000	$ 660,000	$ 631,000
Equity Securities, FV-NI, Unrealized Gain (Loss), Total	1,632,000	$ 2,482,000
Margin Account Borrowings [Member] | Accrued Expenses and Other Liabilities [Member]
Short-term Debt, Total	$ 9,855,000		$ 9,855,000		$ 9,986,000

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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