Long-Term Debt - Schedule of Debt (Details) (Parenthetical) - USD ($)	12 Months Ended
	May 31, 2016	May 31, 2015
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]
Debt instrument interest rate	0.50%	0.50%
Debt instrument maturity date	Jan. 07, 2019	Jan. 07, 2019
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] | Maximum [Member]
Debt instrument interest rate	4.00%	4.00%
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]
Debt instrument interest rate	0.50%	0.50%
Debt instrument maturity date	Jan. 07, 2019	Jan. 07, 2019
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] | Maximum [Member]
Debt instrument interest rate	4.00%	4.00%
Term Note Payable To International Bank of Commerce, Interest Rate of 4.5%, Refinanced January 7, 2016 [Member]
Debt instrument interest rate	4.50%	4.50%
Debt instrument maturity date	Jan. 07, 2016	Jan. 07, 2016
Revolving Note Ppayable to International Bank of Commerce, Prime Rate of Interest Plus 0.5% But Not Less Than 4.0%, Due January 31, 2018 [Member]
Debt instrument interest rate	0.50%	0.50%
Debt instrument maturity date	Jan. 31, 2018	Jan. 31, 2018
Revolving Note Ppayable to International Bank of Commerce, Prime Rate of Interest Plus 0.5% But Not Less Than 4.0%, Due January 31, 2018 [Member] | Maximum [Member]
Debt instrument interest rate	4.00%	4.00%
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]
Debt instrument interest rate	4.50%	4.50%
Debt instrument maturity date	Jan. 31, 2019	Jan. 31, 2019
Debt instrument principal and interest amount	$ 26,215	$ 26,215
Note Payable to Robert Rosene, 7.5% Interest, Due January 15, 2018 [Member]
Debt instrument interest rate	7.50%	7.50%
Debt instrument maturity date	Jan. 15, 2018	Jan. 15, 2017
Note Payable to Yorktown Management & Financial Services, LLC, 5.0% Interest, Due February 28, 2019, Monthly Principal and Interest Payments of $20,629 [Member]
Debt instrument interest rate	5.00%	5.00%
Debt instrument maturity date	Feb. 28, 2019	Feb. 28, 2019
Debt instrument principal and interest amount	$ 20,629	$ 20,629