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Marketable Equity Securities (Details 3) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Marketable Equity Securities        
Unrealized loss on marketable securities $ (148) $ 484 $ (270) $ 251
Realized gain on marketable equity securities sold 6 0 19 25
Net (loss) on marketable securities $ (142) $ 484 $ (251) $ 276