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Note 4 - Marketable Equity Securities - Unrealized Gains and Losses on Marketable Equity Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Gross unrealized gains $ 15,539 $ 13,478
Gross unrealized losses 2,630 2,100
Unrealized gain $ 12,909 $ 11,378