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GEOGRAPHIC AND SEGMENT INFORMATION - Schedule of Segment Reporting Information (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Jan. 01, 2019
Long-term assets by reportable segments            
Net property, plant and equipment $ 20,481,000   $ 20,481,000   $ 20,553,000  
Restricted cash 3,784,000   3,784,000   3,732,000  
Operating lease right-of-use assets 513,000   513,000     $ 595,870
Notes receivable, non-current         1,493,000  
Total long-term assets 24,778,000   24,778,000   25,778,000  
Statement of Operations, Loss before taxes            
Mineral property expenses 851,000 $ 955,000 2,309,000 $ 2,706,000    
General and administrative 1,359,000 1,705,000 4,764,000 5,437,000    
Arbitration expenses 146,000 98,000 631,000 225,000    
Acquisition related expenses       333,000    
Accretion of asset retirement costs 197,000 133,000 353,000 401,000 993,000  
Depreciation and amortization 23,000 27,000 71,000 94,000    
Impairment of Uranium properties       17,968,000    
Total operating expenses (2,576,000) (2,918,000) (8,128,000) (27,164,000)    
Other income (expense) 742,000 (219,000) 345,000 152,000    
Loss before taxes (1,834,000) (3,137,000) (7,783,000) (27,012,000)    
Corporate            
Long-term assets by reportable segments            
Net property, plant and equipment 126,000   126,000   162,000  
Operating lease right-of-use assets 490,000   490,000      
Total long-term assets 616,000   616,000   162,000  
Statement of Operations, Loss before taxes            
General and administrative 844,000 1,086,000 3,208,000 3,676,000    
Arbitration expenses 146,000 98,000 631,000 225,000    
Acquisition related expenses       333,000    
Depreciation and amortization 1,000 1,000 3,000 3,000    
Total operating expenses (991,000) (1,185,000) (3,842,000) (4,237,000)    
Other income (expense) 13,000 (246,000) (384,000) 8,000    
Loss before taxes (978,000) (1,431,000) (4,226,000) (4,229,000)    
Uranium            
Long-term assets by reportable segments            
Net property, plant and equipment 11,383,000   11,383,000   11,418,000  
Restricted cash 3,774,000   3,774,000   3,722,000  
Operating lease right-of-use assets 23,000   23,000      
Notes receivable, non-current         1,493,000  
Total long-term assets 15,180,000   15,180,000   16,633,000  
Statement of Operations, Loss before taxes            
Mineral property expenses 583,000 600,000 1,942,000 2,204,000    
General and administrative 447,000 478,000 1,272,000 1,383,000    
Accretion of asset retirement costs 197,000 133,000 353,000 401,000    
Depreciation and amortization 22,000 26,000 68,000 90,000    
Impairment of Uranium properties       17,968,000    
Total operating expenses (1,249,000) (1,237,000) (3,635,000) (22,046,000)    
Other income (expense) 729,000 27,000 729,000 144,000    
Loss before taxes (520,000) (1,210,000) (2,906,000) (21,902,000)    
Lithium            
Statement of Operations, Loss before taxes            
Mineral property expenses 237,000 317,000 239,000 455,000    
General and administrative 1,000   1,000      
Total operating expenses (238,000) (317,000) (240,000) (455,000)    
Loss before taxes (238,000) (317,000) (240,000) (455,000)    
Graphite            
Long-term assets by reportable segments            
Net property, plant and equipment 8,972,000   8,972,000   8,973,000  
Restricted cash 10,000   10,000   10,000  
Total long-term assets 8,982,000   8,982,000   $ 8,983,000  
Statement of Operations, Loss before taxes            
Mineral property expenses 31,000 38,000 128,000 47,000    
General and administrative 67,000 141,000 283,000 378,000    
Depreciation and amortization       1,000    
Total operating expenses (98,000) (179,000) (411,000) (426,000)    
Loss before taxes $ (98,000) $ (179,000) $ (411,000) $ (426,000)