Debt - Schedule of Debt (Details) - USD ($)	Nov. 30, 2015	May. 31, 2015
Total Notes Payable	$ 11,945,767	$ 12,579,011
Other note payable	57,098	59,574
Less: Current portion	(2,009,713)	(2,278,164)
Long-term Debt	9,936,054	10,300,847
Term Note Payable To International Bank Of Commerce, Interest Rate Of 4.5%, Due January 31, 2019, Monthly Principal And Interest Payments Of $171,760 [Member]
Total Notes Payable	6,063,942	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	650,000	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	3,108,727	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