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4. Property, Plant and Equipment, net (Tables)
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment
   December 31, 
   2018   2017 
Land  $1,747   $1,747 
Buildings and improvements   17,520    17,260 
Machinery and equipment   29,692    27,539 
Vehicles   937    901 
Office equipment   838    734 
Construction in process   546    1,683 
    51,280    49,864 
Less accumulated depreciation   (26,707)   (25,219)
Total property, plant and equipment, net  $24,573   $24,645