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Note D - Marketable Equity Securities (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Equity Securities, Impairment Loss, Cumulative Amount					$ 2,314,000
Investment Income, Dividend	$ 308,000	$ 225,000	$ 780,000	$ 718,000
Equity Securities, FV-NI, Unrealized Gain (Loss), Total	586,000
Margin Account Borrowings [Member] | Accrued Expenses and Other Liabilities [Member]
Short-term Debt, Total	$ 7,552,000		$ 7,552,000		$ 5,903,000

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+ References

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