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Note 5 - Non-operating Income - Summary of Non-operating Income (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 31, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Dividends and net realized gains and losses on sales of securities |  | $ 1,724,000 | $ 1,681,000 | $ 3,780,000 | $ 2,914,000
Interest income |  | 2,648,000 | 1,794,000 | 5,186,000 | 3,349,000
Equity in earnings of unconsolidated investments |  | 584,000 | 221,000 | 651,000 | 1,756,000
Gain on sale of unconsolidated company | $ 1,024,000 | 0 | 0 | 1,024,000 | (0)
Total non-operating income |  | $ 4,956,000 | $ 3,696,000 | $ 10,641,000 | $ 8,019,000

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