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Operating Leases (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Summary of total lease and operating expense        
Lease and operating expenses $ 174,278 $ 163,496 $ 512,529 $ 450,517