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Investments in Marketable Securities (Details) - Schedule of marketable securities - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Schedule of marketable securities [Abstract]        
Realized gain (loss) $ 661 $ 597 $ 1,084 $ 544
Unrealized gain (loss) 653 212 (1,395) (614)
Dividend income 484 246 770 259
Interest income       4
Total $ 1,798 $ 1,055 $ 459 $ 193