Leases (Details Narrative) - USD ($)	12 Months Ended
	May 31, 2020	May 31, 2019
Lessee, Lease, Description [Line Items]
Right of use asset	$ 181,525	$ 180,794
Right of use liability	182,525	180,794
Finance lease cost	3,018,403	3,104,078
Amortization of assets	$ 906,909	1,093,761
Equipment One [Member]
Lessee, Lease, Description [Line Items]
Operating lease term	52 months
Operating lease discount rate	5.40%
Equipment Two [Member]
Lessee, Lease, Description [Line Items]
Operating lease term	48 months
Operating lease discount rate	5.40%
Office Space [Member]
Lessee, Lease, Description [Line Items]
Payments of monthly rental amount	$ 48,000	$ 48,000
Operating lease term	90 months
Operating lease discount rate	5.00%
Sale and Leaseback Agreement [Member] | Yorktown Production Equipment [Member]
Lessee, Lease, Description [Line Items]
Finance lease term	4 years
Value of production equipment purchased	$ 968,168
Lease maturity date	Dec. 27, 2022
Bargain purchase option amount	$ 10,000
Sale and Leaseback Agreement [Member] | Yorktown Production Equipment [Member] | Initial Thirty Nine Months [Member]
Lessee, Lease, Description [Line Items]
Payments of monthly rental amount	27,915
Sale and Leaseback Agreement [Member] | Yorktown Production Equipment [Member] | Remaining Twelve Months [Member]
Lessee, Lease, Description [Line Items]
Payments of monthly rental amount	$ 7,695
Three Year Lease Agreements with Five Year Terms [Member]
Lessee, Lease, Description [Line Items]
Finance lease term	5 years
Lease interest rate	7.40%
Finance lease cost	$ 6,900,000
Lease payment per invoice rate	$ 3.32
Payments of monthly rental amount	$ 152,720