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4. Property, Plant and Equipment, net (Tables)
9 Months Ended
Sep. 30, 2020
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment
   September 30,
2020
   December 31,
2019
 
Land  $1,565   $1,565 
Buildings and improvements   17,744    17,332 
Machinery and equipment   30,930    30,670 
Vehicles   778    778 
Office equipment   849    851 
Construction in process   455    362 
    52,321    51,558 
Less accumulated depreciation   (31,239)   (29,284)
Total property, plant and equipment, net  $21,082   $22,274