Property, Plant and Equipment, net (Narrative) (Details)	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2016 ft² item	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Property, Plant and Equipment, net [Abstract]
Depreciation expense		$ 406,761	$ 361,001	$ 801,881	$ 744,561
Number of unoccupied buildings with letter of intent to sale | item	2
Area of building | ft²	52,000
Assets held for sale, net		$ 688,750		$ 688,750		$ 688,750