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4. Property, Plant and Equipment, net (Tables)
6 Months Ended
Jun. 30, 2018
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment

Property, plant and equipment consisted of the following:

 

    June 30,
2018
    December 31,
2017
 
Land   $ 1,747     $ 1,747  
Buildings and improvements     17,379       17,260  
Machinery and equipment     29,774       27,539  
Vehicles     901       901  
Office equipment     879       734  
Construction in process     1,089       1,683  
      51,769       49,864  
Less accumulated depreciation     (26,526 )     (25,219 )
Total property, plant and equipment, net   $ 25,243     $ 24,645