Debt - Schedule of Debt (Details) - USD ($)	Feb. 29, 2016	May. 31, 2015
Total Notes Payable	$ 15,447,822	$ 12,579,011
Less: Current portion	(4,247,218)	(2,278,164)
Long-term Debt	11,200,604	$ 10,300,847
Term Note A Payable To International Bank Of Commerce, Prime Rate Of Interest Plus 0.5% But Not Less Than 4%, Due January 31, 2019 [Member]
Total Notes Payable	5,447,504
Term Note B Payable To International Bank Of Commerce, Prime Rate Of Interest Plus 0.5% But Not Less Than 4%, Due January 31, 2019 [Member]
Total Notes Payable	$ 2,926,643
Term note payable to International Bank of Commerce, interest rate of 4.5%, due January 31, 2019 (refinanced January 7, 2016) [Member]
Total Notes Payable		$ 6,945,884
Revolving Note Payable To International Bank Of Commerce, Prime Rate Of Interest Plus 0.5% But Not Less Than 4.0%, Due January 31, 2018 [Member]
Total Notes Payable	$ 1,200,000	300,000
Term Note Payable By GRE To International Bank Of Commerce, Interest Rate Of 4.5%, Due January 31, 2019, Monthly Principal And Interest Payments Of $26,215 [Member]
Total Notes Payable	3,065,285	3,207,553
Note Payable To Robert Rosene, 7.5% Interest, Due January 15, 2017 [Member]
Total Notes Payable	2,066,000	$ 2,066,000
Note Payable To Yorktown Management & Financial, Llc, 5% Interest, Due February 28, 2019, Monthly Principal And Interest Payments Of $20,629 [Member]
Total Notes Payable	688,296
Other Note Payable [Member]
Total Notes Payable	$ 54,094	$ 59,574