Debt - Schedule of Debt (Details) - USD ($)	Nov. 30, 2016	May 31, 2016
Debt issue costs, net of amortization	$ (225,213)	$ (69,185)
Long-term debt	21,252,763	15,377,563
Less: Current portion	(4,340,096)	(2,088,327)
Long-term Debt	16,912,667	13,289,236
Term Note A Payable To International Bank of Commerce, Prime Rate of Interest Plus 0.5% But Not Less Than 4%, Maturing January 7, 2019 [Member]
Long-term debt gross	4,969,030	5,310,179
Term Note B Payable To International Bank of Commerce, Prime Rate of Interest Plus 0.5% But Not Less Than 4%, Maturing January 7, 2019 [Member]
Long-term debt gross	2,206,666	2,688,659
Revolving Note Payable to International Bank of Commerce, Prime Rate of Interest Plus 0.5% But Not Less Than 4.0%, Due January 31, 2019 [Member]
Long-term debt gross	1,400,000	1,675,000
Term Note Payable by GRE to International Bank of Commerce, Interest Rate of 4.5%, Monthly Principal and Interest Payments of $26,215, Due January 31, 2019 [Member]
Long-term debt gross	2,932,721	3,021,734
Capital Lease with a Private Pallet Leasing Company, Interest Rate of 5%, Maturity of August 7, 2019 [Member]
Long-term debt gross	4,865,070
Note Payable to Robert Rosene, 7.5% Interest, Due January 15, 2018 [Member]
Long-term debt gross	4,534,331	2,066,000
Note Payable to Yorktown Management & Financial Services, LLC, 5.0% Interest, Due February 28, 2019, Monthly Principal and Interest Payments of $20,629 [Member]
Long-term debt gross	525,758	634,616
Other Note Payable [Member]
Long-term debt gross	$ 44,400	$ 50,560