Property and Equipment (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Summary of property and equipment
Property and equipment, gross	$ 30,227,057	$ 24,042,859
Less: accumulated depreciation	14,158,322	10,832,231
Property and equipment, net	16,068,735	13,210,628
Property and plant [Member]
Summary of property and equipment
Property and equipment, gross	24,783,378	18,742,014
Equipment and machinery [Member]
Summary of property and equipment
Property and equipment, gross	3,691,593	3,883,441
Office equipment and furniture [Member]
Summary of property and equipment
Property and equipment, gross	1,216,415	917,702
Motor vehicles [Member]
Summary of property and equipment
Property and equipment, gross	$ 535,671	$ 499,702

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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