PROPERTY, PLANT AND EQUIPMENT (Details) (USD $)	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 47,343,457	$ 45,801,441
Less accumulated depreciation	27,843,864	26,479,005
Property, Plant and Equipment, Net	19,499,593	19,322,436
Depreciation of property, plant and equipment	1,919,497	1,806,567	1,772,668
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,949,449	1,946,228
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	21,799,914	20,980,144
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	14,975,564	14,201,851
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	6,172,741	5,514,662
Automotive equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,607,259	1,504,380
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 838,530	$ 1,654,176