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Note D - Marketable Equity Securities (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Investment Income, Dividend	$ 326,000	$ 307,000	$ 631,000	$ 586,000
Equity Securities, FV-NI, Unrealized Gain (Loss), Total	2,482,000	$ 589,000
Margin Account Borrowings [Member] | Accrued Expenses and Other Liabilities [Member]
Short-term Debt, Total	$ 9,986,000		$ 9,986,000		$ 7,474,000

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Section 50
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Amount of dividend income on nonoperating securities.

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