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Note 6 - Investments - Gross Realized Gains and Losses on Available-for-sale Investments, Limited Liability Investment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Gross realized gains $ 0 $ 0 $ 2 $ 1
Gross realized losses 0 (16) 0 (21)
Net $ 0 $ (16) $ 2 $ (20)