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Mineral property (GDLR) (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 25, 2016
USD ($)
Mar. 31, 2015
USD ($)
Apr. 30, 2014
USD ($)
item
Dec. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Property, Plant and Equipment [Line Items]          
Mineral Properties, Net       $ 5,406 $ 3,874
Guadalupe De Los Reyes Mexico [Member]          
Property, Plant and Equipment [Line Items]          
Percentage of interest owned 100.00%        
Mineral Properties, Net       2,224 $ 1,728
Guadalupe De Los Reyes Mexico [Member] | Option Agreement [Member] | Great Panther Silver Limited [Member]          
Property, Plant and Equipment [Line Items]          
Percentage of interest in joint venture to be returned upon election not to make payment     70.00%    
Sale price of gold project     $ 5,000    
Number of payments | item     5    
Period of payment     3 years    
First Year [Member] | Guadalupe De Los Reyes Mexico [Member] | Option Agreement [Member] | Great Panther Silver Limited [Member]          
Property, Plant and Equipment [Line Items]          
Sale price of gold project     $ 1,000    
Proceeds from sale of gold project   $ 496   $ 500  
Second Year [Member] | Guadalupe De Los Reyes Mexico [Member] | Option Agreement [Member] | Great Panther Silver Limited [Member]          
Property, Plant and Equipment [Line Items]          
Sale price of gold project     1,500    
Amount of payment not made $ 1,500        
Third Year [Member] | Guadalupe De Los Reyes Mexico [Member] | Option Agreement [Member] | Great Panther Silver Limited [Member]          
Property, Plant and Equipment [Line Items]          
Sale price of gold project     $ 2,500