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

December 31,

2019

   

December 31,

2018

 
Land   $ 4,104     $ 4,116  
Plant and buildings     83,139       82,445  
Furniture and fixtures     1,094       1,056  
Machinery and equipment     4,252       3,928  
Construction in progress     12,571       3,581  
GAFI property held for development     15,408       15,408  
Total gross property, plant & equipment     120,568       110,534  
Less accumulated depreciation     (36,342 )     (32,042 )
Total net property, plant & equipment   $ 84,226     $ 78,492  
Depreciation of property, plant, and equipment
    Years  
Plant and buildings     20 - 30  
Machinery and equipment     5 - 7  
Furniture and fixtures     3 - 5