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4. Property, Plant and Equipment, net
9 Months Ended
Sep. 30, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, net

Property, plant and equipment consisted of the following:

 

   September 30,
2017
   December 31,
2016
 
Land  $1,747   $1,747 
Buildings and improvements   17,052    16,428 
Machinery and equipment   26,625    23,122 
Vehicles   861    848 
Office equipment   734    709 
Construction in process   1,454    1,873 
    48,473    44,727 
Less accumulated depreciation   (24,585)   (22,895)
Total property, plant and equipment, net  $23,888   $21,832