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PLANT AND EQUIPMENT AND MINERAL PROPERTIES (Tables)
 3 Months Ended
Mar. 31, 2016
Schedule of Property, Plant and Equipment [Table Text Block]
          March 31,                 December 31,        
          2016                 2015        
          Accumulated                 Accumulated     Net Book  
    Cost     Depreciation     Net Book Value     Cost     Depreciation     Value  
Plant and equipment                                    
 Nichols Ranch $ 29,210   $ (3,472 ) $ 25,738   $ 29,210   $ (2,370 ) $ 26,840  
 Equipment and other   13,198     (11,021 )   2,177     13,107     (10,878 )   2,229  
Plant and equipment total $ 42,408   $ (14,493 ) $ 27,915   $ 42,317   $ (13,248 ) $ 29,069  
Schedule of Summary of Mineral Properties [Table Text Block]
    March 31,     December 31,  
    2016     2015  
Mineral properties            
  In-situ Recovery            
     Uranerz ISR properties $ 36,065   $ 36,096  
In-situ Recovery total $ 36,065   $ 36,096  
  Conventional            
     Sheep Mountain   34,183     34,183  
     Roca Honda   19,465     19,465  
     Other   1,287     1,287  
  Conventional total   54,935     54,935  
Mineral Properties total $ 91,000   $ 91,031