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Property, Plant and Equipment (Tables)
 3 Months Ended
Mar. 31, 2018
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment

    Net Book Value of Property, Plant and Equipment at March 31, 2018  
(thousands of dollars)   Turkey     Texas     New Mexico     Corporate     Total  
Uranium plant   $ -     $ 8,304     $ -     $ -     $ 8,304  
Mineral rights and properties     17,968       -       7,806       -       25,774  
Other property, plant and equipment     10       1,089       -       198       1,297  
 Total   $ 17,978     $ 9,393     $ 7,806     $ 198     $ 35,375  

 

    Net Book Value of Property, Plant and Equipment at December 31, 2017  
(thousands of dollars)   Turkey     Texas     New Mexico     Corporate     Total  
Uranium plant   $ -     $ 8,304     $ -     $ -     $ 8,304  
Mineral rights and properties     17,968       -       7,806       -       25,774  
Other property, plant and equipment     11       1,109       -       211       1,331  
 Total   $ 17,979     $ 9,413     $ 7,806     $ 211     $ 35,409