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4. Property, Plant and Equipment, net
3 Months Ended
Mar. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, net

Property, plant and equipment consisted of the following:

 

    March 31,
2018
    December 31,
2017
 
Land   $ 1,747     $ 1,747  
Buildings and improvements     17,323       17,260  
Machinery and equipment     28,158       27,539  
Vehicles     901       901  
Office equipment     734       734  
Construction in process     1,768       1,683  
      50,631       49,864  
Less accumulated depreciation     (25,804 )     (25,219 )
Total property, plant and equipment, net   $ 24,827     $ 24,645