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5. Operating Leases (Details Narrative) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Operating Leases Details Narrative        
Rent expense $ 852,431 $ 817,648 $ 1,667,483 $ 1,632,700