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Marketable Equity Securities (Details 3) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Unrealized loss on marketable securities $ (122) $ (233)
Realized gain on marketable equities securities sold 13 25
Net loss on marketable securities $ (109) $ (208)