Property, Plant and Equipment (Details) (USD $)	Jan. 31, 2013	Jan. 31, 2012
Land and improvements	$ 173,000	$ 173,000
Building and improvements	2,522,000	2,510,000
Machinery and equipment	7,207,000	6,724,000
Patterns, dies and tools	691,000	611,000
Furniture and fixtures	1,801,000	1,635,000
Construction in progress	695,000	776,000
Property, Plant and Equipment, Gross	13,089,000	12,429,000
Less: accumulated depreciation	(8,555,000)	(8,223,000)
Property, plant and equipment, net	$ 4,534,000	$ 4,206,000