Equipment and Leasehold Improvements (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of equipment and leasehold improvements
Property, Plant and Equipment, Gross	$ 19,171,536	$ 18,884,273
Less: Accumulated depreciation and amortization	(16,143,865)	(15,171,191)
Property, Plant and Equipment, Net, Total	3,027,671	3,713,082
Machinery and equipment [Member]
Reconciliation of equipment and leasehold improvements
Property, Plant and Equipment, Gross	13,559,018	13,323,315
Office equipment [Member]
Reconciliation of equipment and leasehold improvements
Property, Plant and Equipment, Gross	731,352	729,517
Office furniture [Member]
Reconciliation of equipment and leasehold improvements
Property, Plant and Equipment, Gross	108,093	108,093
Leasehold improvements [Member]
Reconciliation of equipment and leasehold improvements
Property, Plant and Equipment, Gross	4,748,660	4,723,348
Construction in progress [Member]
Reconciliation of equipment and leasehold improvements
Property, Plant and Equipment, Gross	$ 24,413

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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