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Note 7 - Marketable Securities - Summary of Gross Realized Gains and Losses from Sale of Available-for-sale Marketable Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Gross realized gains from sale of available-for-sale marketable securities $ 0 $ 4 $ 16 $ 19
Gross realized losses from sale of available-for-sale marketable securities $ 0 $ 0 $ 0 $ (5)