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Note 4 - Marketable Equity Securities (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investment Income, Dividend	$ 1,309,000	$ 1,171,000	$ 999,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	8,587,000	12,399,000
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	2,443,000	3,721,000
Margin Account Borrowings [Member] | Accrued Expenses and Other Liabilities [Member]
Short-term Debt, Total	$ 7,474,000	$ 11,281,000
Debt, Weighted Average Interest Rate	2.40%	3.11%

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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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