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Segment Reporting (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Number of reportable segments | segment     2    
Revenue $ 30,768 $ 21,391 $ 62,919 $ 45,727  
Exploration expenses 1,251 1,136 2,436 1,958  
Net income (loss) 3,754 864 9,211 5,240 $ 4,150
Capital expenditures 8,887 $ 8,610 16,026 16,467  
Accrued capital expenditures     (918) (4,328)  
Non - cash additions       1,321  
Capital expenditures on a cash basis     15,108 $ 10,818  
Assets $ 146,149   $ 146,149   132,923
Concentration risk 94.00% 94.00% 94.00% 94.00%  
Mexico          
Revenue $ 30,768 $ 21,391 $ 62,919 $ 45,727  
Exploration expenses 490 226 986 604  
Net income (loss) 7,036 3,629 15,624 10,066  
Capital expenditures 5,832 5,057 11,704 10,114  
Assets 98,736   98,736   87,739
Nevada          
Exploration expenses 726 873 1,377 1,277  
Net income (loss) (791) (874) (1,499) (1,286)  
Capital expenditures 3,055 3,550 4,322 6,344  
Assets 30,181   30,181   25,741
Corporate and Other          
Exploration expenses 35 37 73 77  
Net income (loss) (2,491) (1,891) (4,914) (3,540)  
Capital expenditures   $ 3   $ 9  
Assets $ 17,232   $ 17,232   $ 19,443