PROPERTY, PLANT AND EQUIPMENT (Details 1) (USD $)	May 31, 2013	May 31, 2012
PROPERTY, PLANT AND EQUIPMENT [Abstract]
Production machinery and equipment	$ 10,717,493	$ 10,121,006
Building and land	4,663,339	4,663,339
Leasehold improvements	203,034	188,124
Furniture and fixtures	171,093	161,592
Gross Property, Plant and Equipment	15,754,959	15,134,061
Less: Accumulated depreciation	(8,710,820)	(7,335,883)
Net Property, Plant and Equipment	$ 7,044,139	$ 7,798,178