Leases (Details Narrative) - USD ($)	3 Months Ended
	Aug. 31, 2020	Aug. 31, 2019
Lessee, Lease, Description [Line Items]
Finance lease cost	$ 742,008	$ 717,098
Amortization of assets	$ 288,414	208,157
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	$ 12,000	$ 12,000
Operating lease term	60 months
Operating lease discount rate	5.00%
Sale and Leaseback Agreement [Member] | Yorktown Production Equipment [Member]
Lessee, Lease, Description [Line Items]
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 Six Months [Member]
Lessee, Lease, Description [Line Items]
Payments of monthly rental amount	27,915
Sale and Leaseback Agreement [Member] | Yorktown Production Equipment [Member] | Following Twelve Months [Member]
Lessee, Lease, Description [Line Items]
Payments of monthly rental amount	7,695
Non- Cancelable Financing Leases [Member] | Production Equipment [Member]
Lessee, Lease, Description [Line Items]
Production equipment gross carrying amount	8,473,357
Three Lease Agreements with Five Year Terms [Member]
Lessee, Lease, Description [Line Items]
Finance lease cost	$ 6,900,000
Finance lease term	5 years
Lease interest rate	7.40%
Lease payment per invoice rate	$ 3.32
Payments of monthly rental amount	$ 153,000