4. Property, Plant and Equipment, net (Tables)

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Schedule of property, plant and equipment

	December 31,
	2020			2019
Land	$	1,565		$	1,565
Buildings and improvements		17,834			17,332
Machinery and equipment		31,707			30,670
Vehicles		778			778
Office equipment		857			851
Construction in process		228			362
		52,969			51,558
Less accumulated depreciation		(31,921	)		(29,284	)
Total property, plant and equipment, net	$	21,048		$	22,274