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Note 5 - Non-operating Income - Summary of Non-operating Income (Details) - USD ($)	1 Months Ended	3 Months Ended
	Jan. 31, 2024	Mar. 31, 2024	Mar. 31, 2023
Dividends and net realized gains and losses on sales of securities		$ 2,056,000	$ 1,233,000
Interest income		2,538,000	1,555,000
Equity in earnings of unconsolidated investments		67,000	1,535,000
Gain on sale of unconsolidated company	$ 1,024,000	1,024,000	(0)
Total non-operating income		$ 5,685,000	$ 4,323,000

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- Definition

The amount of dividends and other net realized gains and losses resulting from the sale of securities.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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