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Marketable Equity Securities (Tables)
3 Months Ended
Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Marketable securities and adjustment to fair value
(in thousands)  

 March 31,

2020

   

 December 31,

2019

 
  Marketable equity securities at cost   $ 1,828     $ 1,879  
  Cumulative unrealized loss on marketable equity securities     (1,073 )     (840 )
  Marketable equity securities at fair value   $ 755     $ 1,039  
Changes in marketable securities
(in thousands)  

Three months ended

March 31,

 
    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 loss on marketable equity securities     (208 )     (326 )
Change in marketable equity securities at fair value   $ (284 )   $ (326 )
Realized and unrealized gain (loss) on marketable equity securities
(in thousands)  

Three months ended

March 31,

 
    2020     2019  
  Unrealized loss on marketable securities   $ (233 )   $ (326 )
  Realized gain on marketable equity securities sold     25       -  
  Net loss on marketable securities   $ (208 )   $ (326 )