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Note D - Marketable Equity Securities (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Investment Income, Dividend	$ 348,000	$ 308,000	$ 931,000	$ 780,000
Equity Securities, FV-NI, Unrealized Gain (Loss), Total	133,000	$ 586,000
Margin Account Borrowings [Member] | Accrued Expenses and Other Liabilities [Member]
Short-term Debt, Total	$ 8,992,000		$ 8,992,000		$ 11,281,000

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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