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Note 5 - Non-operating Income - Summary of Non-operating Income (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Equity in earnings of unconsolidated investments |  | $ 589,000 | $ 2,015,000 | $ 477,000
Dividends and net realized gains or losses on the sale of securities |  | 7,973,000 | 6,262,000 | 5,530,000
Interest income |  | 10,104,000 | 8,383,000 | 5,134,000
Gain on sale of unconsolidated company | $ 1,024,000 | 1,024,000 | (0) | (0)
Total non-operating income |  | $ 19,690,000 | $ 16,660,000 | $ 11,141,000

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