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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

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Intangible assets and goodwill gross.

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The accumulated amount of amortization of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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Sum of the carrying amounts (original costs for current and prior period additions adjusted for impairment, if any) as of the balance sheet date of intangible assets, excluding goodwill, having a projected indefinite period of benefit.

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