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Mineral property (GDLR) (Details) - Guadalupe De Los Reyes, Mexico [Member] - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 25, 2016
Mar. 31, 2015
Apr. 30, 2014
Dec. 31, 2014
Property, Plant and Equipment [Line Items]        
Percentage of interest owned 100.00%      
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  
Period of payment     3 years  
Proceeds from sale of gold project       $ 500
Proceeds from sale of gold project, net of legal costs   $ 500    
First Year [Member] | Option Agreement [Member] | Great Panther Silver Limited [Member]        
Property, Plant and Equipment [Line Items]        
Sale price of gold project     $ 1,000  
Second Year [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] | Option Agreement [Member] | Great Panther Silver Limited [Member]        
Property, Plant and Equipment [Line Items]        
Sale price of gold project     $ 2,500