Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) (USD $)	Oct. 31, 2013	Jan. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 8,205,000	$ 13,230,000
Less - accumulated depreciation	4,081,000	3,762,000
Property, plant and equipment, net	4,124,000	9,468,000
Land and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	473,000	471,000
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,709,000	2,587,000
Furniture, Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,427,000	3,060,000
Trucks and Other Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,596,000	1,803,000
Construction Project Costs of Variable Interest Entities [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross		$ 5,309,000