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Note 4 - Marketable Equity Securities (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity Securities, Impairment Loss, Cumulative Amount		$ 2,314,000
Investment Income, Dividend	$ 1,171,000	999,000	$ 1,024,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	12,399,000	2,980,000
Available-for-sale Equity Securities, Gross Unrealized Loss	$ 3,721,000	$ 126,000
Debt, Weighted Average Interest Rate	3.11%	2.07%
Margin Account Borrowings [Member] | Accrued Expenses and Other Liabilities [Member]
Short-term Debt, Total	$ 11,281,000	$ 5,903,000

X

- Definition

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

+ References

No definition available.

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- Definition

Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
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-SubTopic 10
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