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3. Property, Plant and Equipment (Tables)
 3 Months Ended
Mar. 31, 2018
Statement of Operations Data  
Schedule of Property, plant and equipment
   

March 31,

2018

    

December 31,

2017

  
Land   $ 2,736     $ 2,747  
Plant and buildings     82,444       82,652  
Furniture and fixtures     1,001       1,003  
Machinery and equipment     3,954       3,972  
Construction in progress     1,901       941  
GAFI property, plant & equipment     15,408       15,408  
Total gross property, plant & equipment     107,444       106,723  
Less accumulated depreciation     (28,938 )     (27,886 )
Total net property, plant & equipment   $ 78,506     $ 78,837  
                 
Depreciation of property, plant, and equipment
    Years  
Plant and buildings     20 - 30  
Machinery & equipment     5 - 7  
Furniture & fixtures     3 - 5