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Commitments and Contingencies (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jul. 12, 2018
Loss Contingencies [Line Items]        
Rent expense $ 100,000 $ 100,000 $ 100,000  
Pending Litigation        
Loss Contingencies [Line Items]        
Estimate of potential loss from litigation       $ 510,000
Interest rate percentage charged on loss contingencies       18.00%
Minimum        
Loss Contingencies [Line Items]        
Percentage of royalty obligations 0.50%      
Maximum        
Loss Contingencies [Line Items]        
Percentage of royalty obligations 5.00%      
Royalty Agreement        
Loss Contingencies [Line Items]        
Minimum payments under commitment $ 61,800      
Percentage of royalty obligations, majority are less than 3.00%      
Royalty Agreement | Royalty        
Loss Contingencies [Line Items]        
Costs applicable to mining revenue $ 100,000 $ 100,000 $ 100,000