Property, Plant and Equipment - Schedule of Property Plant and Equipment (Details) - USD ($)	Feb. 28, 2018	May 31, 2017
Property plant and equipment, gross	$ 39,085,462	$ 33,446,479
Less: Accumulated depreciation and amortization	(16,200,844)	(13,739,697)
Net Property, Plant and Equipment	22,884,618	19,706,782
Production Machinery and Equipment [Member]
Property plant and equipment, gross	33,026,562	27,493,614
Plant Buildings and Land [Member]
Property plant and equipment, gross	5,306,784	5,296,784
Leasehold Improvements [Member]
Property plant and equipment, gross	349,246	263,710
Furniture and Fixtures [Member]
Property plant and equipment, gross	$ 402,870	$ 392,371