Supplemental Information of Cash Flows - Summary of Supplemental Information of Cash Flows (Details) - USD ($)	12 Months Ended
	May 31, 2017	May 31, 2016
Supplemental Cash Flow Information [Abstract]
Acquisition of equipment through capital lease	$ 5,323,864
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	1,137,865
Acquisition of equipment in accounts payable	102,019	113,047
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	5,690
Interest paid	$ 1,183,781	$ 542,442