Debt - Schedule of Debt (Details) - USD ($)	Feb. 28, 2017	May 31, 2016
Face value of long-term debt	$ 22,682,050	$ 15,446,748
Debt issue costs, net of amortization	(269,727)	(69,185)
Debt	22,412,323	15,377,563
Less: Current portion	(4,629,186)	(2,088,327)
Long-term Debt	17,783,137	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	4,797,299	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	1,962,157	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	1,900,000	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	2,886,906	3,021,734
Note payable to First Bank, Prime Rate of Interest Plus 1.45% but not Less Than 4.95%, Monthly Principal and Interest Payments of $30,628, Due August 21, 2021, Secured by Equipment [Member]
Long-term debt gross	1,469,713
Capital Lease with a Private Pallet Leasing Company, Interest Rate of 5%, Maturity of August 7, 2019 [Member]
Long-term debt gross	4,380,410
Note Payable to Robert Rosene, 7.5% Interest, Due January 15, 2019 [Member]
Long-term debt gross	4,498,383	2,066,000
Note Payable to Yorktown Management & Financial Services, LLC, 5% Interest, Due February 28, 2019, Monthly Principal and Interest Payments of $20,629 [Member]
Long-term debt gross	470,212	634,616
Other Note Payable [Member]
Long-term debt gross	$ 316,970	$ 50,560