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6. Property, Plant and Equipment, net
12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, net

Property, plant and equipment consisted of the following:

 

   December 31, 
   2016   2015 
Land  $1,747   $1,807 
Buildings and improvements   16,428    16,387 
Machinery and equipment   23,122    22,907 
Vehicles   848    1,298 
Office equipment   709    709 
Construction in process   1,873    311 
    44,727    43,419 
Less accumulated depreciation   (22,895)   (22,044)
Total property, plant and equipment, net  $21,832   $21,375