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3. Property, Plant and Equipment (Tables)
 3 Months Ended
Mar. 31, 2019
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment
   

March 31,

2019  

    

December 31,

2018  

  
Land   $ 4,118     $ 4,116  
Plant and buildings     82,991       82,445  
Furniture and fixtures     1,059       1,056  
Machinery and equipment     4,211       3,928  
Construction in progress     3,412       3,581  

GAFI property, plant & equipment 

     15,408       15,408  

Total gross property, plant & equipment 

     111,199       110,534  

Less accumulated depreciation 

     (33,205 )     (32,042 )
Total net property, plant & equipment   $ 77,994     $ 78,492  
Depreciation of property, plant, and equipment
    Years  
Plant and buildings     20 - 30  
Machinery & equipment     5 - 7  
Furniture & fixtures     3 - 5