PROPERTY, PLANT AND EQUIPMENT (Details Text) (USD $)	12 Months Ended
	May 31, 2013	May 31, 2012
PROPERTY, PLANT AND EQUIPMENT [Abstract]
Production machinery and equipment that wasn't placed into service yet	$ 379,716
Net book value of building and land owned by a variable interest entity	3,591,781
Depreciation expense	$ 1,148,916	$ 1,374,937