Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($)	Feb. 29, 2020	May 31, 2019
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 57,843,677	$ 53,706,523
Less: Accumulated depreciation and amortization	(24,937,955)	(21,026,051)
Net Property, Plant and Equipment	32,905,722	32,680,472
Production Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	49,077,097	45,645,910
Plant Buildings and Land [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	6,869,380	6,336,855
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	1,095,961	979,890
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	601,586	563,074
Right-to-use Assets Under Operating Leases [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 199,653	$ 180,794