Note D - Marketable Equity Securities (Details Textual) - USD ($)	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Equity Securities, Impairment Loss, Cumulative Amount			$ 2,314,000
Investment Income, Dividend	$ 271,000	$ 221,000
Nonoperating Income (Expense) [Member]
Equity Securities, FV-NI, Unrealized Gain (Loss), Total	(1,142,000)
Margin Account Borrowings [Member] \| Accrued Expenses and Other Liabilities [Member]
Short-term Debt, Total	$ 6,281,000		$ 5,903,000

Represents the cumulative amount of impairment loss associated with equity securities as of a specified date.

No definition available.

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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).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
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Amount of dividend income on nonoperating securities.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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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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-Topic 210
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