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4. Property, Plant and Equipment, net
3 Months Ended
Mar. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, net

Property, plant and equipment consisted of the following:

 

   March 31,
2017
   December 31,
2016
 
Land  $1,747   $1,747 
Buildings and improvements   16,472    16,428 
Machinery and equipment   24,881    23,122 
Vehicles   913    848 
Office equipment   717    709 
Construction in process   1,008    1,873 
    45,738    44,727 
Less accumulated depreciation   (23,453)   (22,895)
Total property, plant and equipment, net  $22,285   $21,832