Property and Equipment (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 13,765,907	$ 13,841,872
Less: accumulated depreciation	9,716,429	9,226,358
Property and equipment, net	4,049,478	4,615,514
Depreciation expense	674,000	713,000
Land and land improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	553,063	553,063
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,923,852	3,925,477
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8,299,962	8,313,841
Rental equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 989,030	$ 1,049,491

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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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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- Definition

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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