Note D - Marketable Equity Securities (Details Textual) - USD ($)	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Equity Securities, FV-NI, Realized Gain (Loss), Total	$ (534,000)	$ 0
Investment Income, Dividend	305,000	277,000
Equity Securities, FV-NI, Unrealized Gain (Loss), Total	(8,805,000)	$ 3,184,000
Margin Account Borrowings [Member] \| Accrued Expenses and Other Liabilities [Member]
Short-term Debt, Total	$ 10,242,000		$ 7,474,000

Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-Name Accounting Standards Codification
-Topic 944
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-Section S99
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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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Amount of dividend income on nonoperating securities.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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