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Marketable Equity Securities (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Marketable Equity Securities        
Cost of marketable equity securities sold $ 4 $ 0 $ 69 $ 51
Realized gain on marketable equity securities sold 6 0 19 25
Proceeds from the sale of marketable equity securities sold (10) 0 (88) (76)
Net loss on marketable equity securities (142) 484 (251) 276
Additions to marketable equity securities 0 294 0 294
Change in marketable equity securities at fair value $ (152) $ 778 $ (339) $ 494