Property and Equipment (Details) (USD $)	Jul. 31, 2012	Jan. 31, 2012
Summary of property and equipment
Property, plant and equipment, gross	$ 9,899,000	$ 6,194,000
Less - accumulated depreciation	3,630,000	3,433,000
Property and equipment, net	6,269,000	2,761,000
Land [Member]
Summary of property and equipment
Property, plant and equipment, gross	360,000
Building and leasehold improvements [Member]
Summary of property and equipment
Property, plant and equipment, gross	1,816,000	208,000
Machinery and equipment [Member]
Summary of property and equipment
Property, plant and equipment, gross	3,069,000	2,700,000
Trucks and other vehicles [Member]
Summary of property and equipment
Property, plant and equipment, gross	1,669,000	1,817,000
Construction project costs (variable interest entities) [Member]
Summary of property and equipment
Property, plant and equipment, gross	$ 2,985,000	$ 1,469,000

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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