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Note 4 - Marketable Equity Securities (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Investment Income, Dividend	$ 1,443,000	$ 1,557,000	$ 1,539,000
Equity Securities, FV-NI	6,584,000	8,099,000
Equity Securities, FV-NI, Unrealized Loss	1,689,000	2,630,000
Margin Account Borrowings [Member] | Accrued Expenses And Other Liabilities And Other Long-term Liabilities [Member]
Short-Term Debt	$ 0	$ 0

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