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Marketable Securities (Tables)
3 Months Ended
Mar. 31, 2022
Marketable Securities  
Marketable securities in equity securities with readily determinable market prices consisted of the following as of March 31, 2022 and December 31, 2021:

Marketable securities in equity securities with readily determinable market prices consisted of the following as of March 31, 2022 and December 31, 2021:

 

   Marketable equity securities at March 31, 2022 
       Gross unrealized   Gross unrealized     
   Cost   gains   losses   Fair value 
 Common shares  $16,366,000   $5,268,000   $(5,476,000)  $16,158,000 
                     

 

   Marketable equity securities at December 31, 2021 
       Gross unrealized   Gross unrealized     
   Cost   gains   losses   Fair value 
 Common shares  $53,475,000   $32,000   $(13,127,000)  $40,380,000