Property, Plant and Equipment (Details) (USD $)	Jan. 31, 2013	Jan. 31, 2012
Summary of property, plant and equipment
Property, plant and equipment, gross	$ 13,230,000	$ 6,194,000
Less - accumulated depreciation	3,762,000	3,433,000
Property, plant and equipment, net	9,468,000	2,761,000
Land and improvements [Member]
Summary of property, plant and equipment
Property, plant and equipment, gross	471,000
Building and leasehold improvements [Member]
Summary of property, plant and equipment
Property, plant and equipment, gross	2,587,000	208,000
Furniture, machinery and equipment [Member]
Summary of property, plant and equipment
Property, plant and equipment, gross	3,060,000	2,700,000
Trucks and other vehicles [Member]
Summary of property, plant and equipment
Property, plant and equipment, gross	1,803,000	1,817,000
Construction project costs of variable interest entities [Member]
Summary of property, plant and equipment
Property, plant and equipment, gross	$ 5,309,000	$ 1,469,000