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Note 4 - Marketable Equity Securities (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investment Income, Dividend	$ 1,266,000	$ 1,309,000	$ 1,171,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	10,221,000	8,587,000
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	$ 4,967,000	$ 2,443,000
Margin Account Borrowings [Member]
Debt, Weighted Average Interest Rate	0.75%	2.40%
Margin Account Borrowings [Member] | Accrued Expenses and Other Liabilities [Member]
Short-term Debt, Total	$ 11,251,000	$ 7,474,000

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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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