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Other Assets (Tables)
3 Months Ended
Mar. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets
(in thousands)  March 31, December 31,
  2016 2015
Furniture and Fixtures, net of accumulated depreciation   $ 39    $ 41 
Exploration bonds and other assets   4    4 
Total other assets $ 43  $ 45