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4. Property, Plant and Equipment, net (Tables)
3 Months Ended
Mar. 31, 2020
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment
   March 31,
2020
  December 31,
2019
Land  $1,565   $1,565 
Buildings and improvements   17,420    17,332 
Machinery and equipment   31,085    30,670 
Vehicles   778    778 
Office equipment   851    851 
Construction in process   261    362 
    51,960    51,558 
Less accumulated depreciation   (30,050)   (29,284)
Total property, plant and equipment, net  $21,910   $22,274