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SUPPLEMENTAL FINANCIAL INFORMATION (Tables)
3 Months Ended
Mar. 31, 2016
Schedules of Components of Revenues [Table Text Block]
    Three months ended  
    March 31,  
    2016     2015  
Uranium concentrates $ 17,978   $ 6,995  
Alternate feed materials processing and other   18     605  
Revenues $ 17,996   $ 7,600  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
    Three months ended  
    March 31,  
    2016     2015  
             
Interest income $ 20   $ 22  
Change in value of investments accounted at fair value   69     (76 )
Change in value of warrant liabilities   253     -  
Change in value of convertible debentures   (561 )   709  
Other   307     395  
Other income (expense) $ 88   $ 1,050