Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) (USD $)	Jul. 31, 2014	Jan. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 8,402,000	$ 8,390,000
Less - accumulated depreciation	4,350,000	4,207,000
Property, plant and equipment, net	4,052,000	4,183,000
Land and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	473,000	473,000
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,800,000	2,779,000
Furniture, Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,620,000	3,560,000
Trucks and Other Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,509,000	$ 1,578,000