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Other Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets
(in thousands) December 31,
  2017 2016
Furniture and fixtures, net of accumulated depreciation   $   31    $   32 
Lik project equipment, net of accumulated depreciation 90   - 
Exploration bonds and other assets   4    4 
Vendetta Warrants -   735 
Total other assets $125  $771