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3. Property, Plant and Equipment (Tables)
 9 Months Ended
Sep. 30, 2020
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment
   

September 30,

2020

    

December 31,

2019

  
Land   $ 4,088     $ 4,104  
Plant and buildings     96,089       83,139  
Furniture and fixtures     1,166       1,094  
Machinery and equipment     4,389       4,252  
Construction in progress     18,612       12,571  
Property held for development     15,408       15,408  
Finance lease right of use assets     2,988       -  
Total gross property, plant & equipment     142,740       120,568  
Less accumulated depreciation     (39,690 )     (36,342 )
Total net property, plant & equipment   $ 103,050     $ 84,226  
Depreciation of property, plant, and equipment
    Years  
Plant and buildings     20 - 30  
Machinery and equipment     5 - 10  
Furniture and fixtures     3 - 5