Supplemental Information of Cash Flows - Schedule of Supplemental Information of Cash Flows (Details) - USD ($)	12 Months Ended
	May 31, 2019	May 31, 2018
Supplemental Cash Flow Elements [Abstract]
Acquisition of equipment through capital lease	$ 4,667,380	$ 2,225,685
Revolver loan converted to term loan		2,500,000
Acquisition of equipment in accounts payable	273,565	373,214
Preferred dividend accrual	112,192
Interest paid	$ 1,786,882	$ 1,210,308