Supplemental Information of Cash Flows - Schedule of Supplemental Information of Cash Flows (Details) - USD ($)	12 Months Ended
	May 31, 2018	May 31, 2017
Supplemental Cash Flow Elements [Abstract]
Acquisition of equipment through capital lease	$ 2,225,685	$ 5,323,864
Revolver loan converted to term loan	2,500,000
Acquisition of buildings through note payable		318,750
Acquisition of equipment from related party in exchange for receivable and/or note payable		1,469,713
Acquisition of equipment in accounts payable	373,214	102,019
Conversion of related party accrued interest to long-term debt		2,475,690
Warrants issued as debt service costs		120,000
Preferred dividend accrual		29,726
Interest paid	$ 1,347,364	$ 1,183,781