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4. Property, Plant and Equipment, net
6 Months Ended
Jun. 30, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, net

Property, plant and equipment consisted of the following:

 

    June 30,
2017
    December 31,
2016
 
Land   $ 1,747     $ 1,747  
Buildings and improvements     16,533       16,428  
Machinery and equipment     25,465       23,122  
Vehicles     934       848  
Office equipment     728       709  
Construction in process     1,653       1,873  
      47,060       44,727  
Less accumulated depreciation     (24,050 )     (22,895 )
Total property, plant and equipment, net   $ 23,010     $ 21,832