Properties, Plant and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment, Net

Depreciation is computed using the straight-line method over estimated useful lives as follows:

Building	7 to 15 years
Vehicles and equipment	3 to 7 years
Processing and laboratory	5 to 15 years
Furniture and fixtures	2 to 3 years

Properties, plant and equipment at December 31, 2018 and 2017 consisted of the following:

	2018			2017
Land and building	$	9,169,605		$	9,169,605
Vehicle and equipment	2,319,290			2,414,216
Processing and laboratory	21,129,248			21,166,497
Furniture and fixtures	648,309			755,665
Construction in progress	35,190			—
	33,301,642			33,505,983
Less accumulated depreciation	(23,559,522		)	(20,724,250		)
Total properties, plant and equipment	$	9,742,120		$	12,781,733