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Note 5 - Fair Value Measurements - Reconciles Net Loss to Unrealized Loss on Equity Securities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Net gain (loss) recognized during the period on equity securities $ (13,268) $ 4,840
Less: Net gain (loss) recognized during the period on equity securities sold during the period 609 (237)
Unrealized gain (loss) recognized during the reporting period on equity securities still held at the reporting date $ (13,877) $ 4,603