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Investments in Marketable Securities (Tables)
3 Months Ended
Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of marketable securities
   For the Three Months
Ended March 31,
 
   2021   2020 
Realized gain (loss)  $424   $(44)
Unrealized loss   (2,049)   (835)
Dividend income   286    13 
Interest income   -    4 
   $(1,339)  $(863)