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Business Combinations, Goodwill and Intangible Assets (Details 1) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Composition of goodwill and intangible assets      
Goodwill $ 63,935,487 $ 62,093,948 $ 60,496,314
Amortizable intangible assets      
Total intangible assets 11,271,376 10,879,153  
Accumulated amortization (4,644,589) (4,384,296)  
Total intangible assets, net 6,626,787 6,494,857  
Licenses and others [Member]
     
Amortizable intangible assets      
Finite-Lived Intangible Assets, Gross 2,808,875 2,798,112  
Non-compete agreement [Member]
     
Amortizable intangible assets      
Finite-Lived Intangible Assets, Gross 1,304,151 1,270,807  
Customer list [Member]
     
Amortizable intangible assets      
Finite-Lived Intangible Assets, Gross 1,795,001 1,742,087  
Trademarks [Member]
     
Indefinite-lived Intangible Assets by Major Class [Line Items]      
Trademarks $ 5,363,349 $ 5,068,147