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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, 2025	Mar. 31, 2024
Dividends and net realized gains and losses on sales of securities		$ 1,954,000	$ 2,056,000
Interest income		2,125,000	2,538,000
Equity in earnings of unconsolidated investments		0	67,000
Gain on sale of unconsolidated company	$ 1,024,000	(0)	1,024,000
Total non-operating income		$ 4,079,000	$ 5,685,000

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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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