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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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