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Marketable Equity Securities (Tables)
6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Marketable securities and adjustment to fair value
(in thousands)  

 June 30,

2020

   

 December 31,

2019

 
  Marketable equity securities at cost   $ 2,122     $ 1,879  
  Cumulative unrealized loss on marketable equity securities     (589 )     (840 )
  Marketable equity securities at fair value   $ 1,533     $ 1,039  
Changes in marketable securities
(in thousands)  

Three months ended

June 30,

   

Six months ended

June 30,

 
    2020     2019     2020     2019  
Cost of marketable equity securities sold   $ -     $ -     $ 51     $ -  
Realized gain on marketable equity securities sold     -       -       25       -  
Proceeds from the sale of marketable equity securities sold     -       -       (76 )     -  
Net gain (loss) on marketable equity securities     484       (63 )     276       (389 )
Additions to marketable equity securities     294       -       294       -  
Change in marketable equity securities at fair value   $ 778     $ (63 )   $ 494     $ (389 )
Realized and unrealized gain (loss) on marketable equity securities
(in thousands)  

Three months ended

June 30,

   

Six months ended

June 30,

 
    2020     2019     2020     2019  
  Unrealized gain (loss) on marketable securities   $ 484     $ (63 )   $ 251     $ (389 )
  Realized gain on marketable equity securities sold     -       -       25       -  
  Net gain (loss) on marketable securities   $ 484     $ (63 )   $ 276     $ (389 )