Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($)	Nov. 30, 2019	May 31, 2019
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 55,997,463	$ 53,706,523
Less: Accumulated depreciation and amortization	(23,583,987)	(21,026,051)
Net Property, Plant and Equipment	32,413,476	32,680,472
Production Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	47,323,256	45,645,910
Plant Buildings and Land [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	6,724,513	6,336,855
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	1,129,474	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	$ 218,634	$ 180,794