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Property and Equipment (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Property, Plant and Equipment [Line Items]          
Depreciation expense $ 99,900 $ 109,900 $ 188,705 $ 201,081  
Accumulated depreciation 1,566,662   1,566,662   1,377,960
Capital lease assets, net 97,900   97,900   127,300
Leased equipment [Member]
         
Property, Plant and Equipment [Line Items]          
Depreciation expense 14,700 22,600 29,400 35,300  
Accumulated depreciation $ 379,600   $ 379,600   $ 350,200