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Derivative Instruments (Tables)
12 Months Ended
Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Gain (loss) on derivative instruments
(in thousands)  

Year ended

December 31,

 
     2019      2018  
  Gain on Kinross calls – realized   $ 9     $ -  
  Loss on Vendetta Warrants – unrealized     (47 )     -  
    $ (38 )   $ -