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Note 6 - Non-operating Income - Summary of Non-operating Income (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 31, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Dividends and net realized gains and losses on sales of securities |  | $ 1,683,000 | $ 1,690,000 | $ 5,462,000 | $ 4,604,000
Interest income |  | 2,603,000 | 2,222,000 | 7,790,000 | 5,571,000
Equity in earnings of unconsolidated investments |  | (62,000) | 185,000 | 589,000 | 1,941,000
Gain on sale of unconsolidated company | $ 1,024,000 | 0 | 0 | 1,024,000 | (0)
Total non-operating income |  | $ 4,224,000 | $ 4,097,000 | $ 14,865,000 | $ 12,116,000

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