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Note 5 - Non-operating Income - Summary of Non-operating Income (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Dividends and net realized gains and losses on sales of securities |  | $ 2,089,000 | $ 1,683,000 | $ 5,971,000 | $ 5,462,000
Interest income |  | 2,676,000 | 2,603,000 | 7,388,000 | 7,790,000
Equity in earnings/(loss) of unconsolidated investments |  | (105,000) | (62,000) | 512,000 | 589,000
Gain on sale of unconsolidated company | $ 1,024,000 | 0 | 0 | (0) | 1,024,000
Total non-operating income |  | $ 4,660,000 | $ 4,224,000 | $ 13,871,000 | $ 14,865,000

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