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Goodwill and Intangible Assets (Details Textual) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Goodwill and Intangible Assets (Textual) [Abstract]        
Aggregate amortization expense on intangible assets $ 457,000 $ 469,000 $ 917,366 $ 940,566
Estimated aggregate amortization expense for 2012 904,000   904,000  
Estimated aggregate amortization expense for 2013 1,800,000   1,800,000  
Estimated aggregate amortization expense for 2014 943,000   943,000  
Estimated aggregate amortization expense for 2015 870,000   870,000  
Estimated aggregate amortization expense for 2016 816,000   816,000  
Estimated aggregate amortization expense for 2017 $ 775,000   $ 775,000