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Note 14 - Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2018
Statement Line Items [Line Items]  
Disclosure of contractual obligation [text block]
        Less than
1 year		     1-3 Years     3-5 Years     More than
5 years		  
    Total     2019     2020 - 2021     2022-2023     2024 and over  
Committed Exploration Expenditures    
1,250
      
1,250
      
-
      
-
      
-
  
                                         
Minera Juanicipio
(1)
(2)
    
-
      
-
      
-
      
-
      
-
  
                                         
Office and other commitments    
353
      
217
      
136
      
-
      
-
  
Total Obligations    
1,603
      
1,467
      
136
      
-
      
-