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Marketable Equity Securities (Details 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]        
Unrealized gain (loss) on marketable securities $ 333 $ (347) $ 584 $ (736)
Realized gain on marketable equities securities sold 25 0 50 0
Net gain (loss) on marketable securities $ 358 $ (347) $ 634 $ (736)