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3. Property, Plant and Equipment (Tables)
 6 Months Ended
Jun. 30, 2019
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment
    June 30, 2019     December 31, 2018  
Land   $ 4,121     $ 4,116  
Plant and buildings     83,126       82,445  
Furniture and fixtures     1,063       1,056  
Machinery and equipment     4,227       3,928  
Construction in progress     4,889       3,581  
GAFI property, plant & equipment     15,408       15,408  
Total gross property, plant & equipment     112,834       110,534  
Less accumulated depreciation     (34,327 )     (32,042 )
Total net property, plant & equipment   $ 78,507     $ 78,492  
                 
Depreciation of property, plant, and equipment
    Years  
Plant and Buildings     20-30  
Machinery & Equipment     5-7  
Furniture & Fixtures     3-5