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Segments (Details 1) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Allocation of the long-lived tangible assets based on geography    
US long-lived tangible assets $ 7,158,884 $ 5,976,544
Other countries long-lived tangible assets 25,958,171 24,901,175
Total long-lived tangible assets 33,117,055 30,877,719
Argentina [Member]
   
Allocation of the long-lived tangible assets based on geography    
Other countries long-lived tangible assets 14,435,776 14,316,612
Brazil [Member]
   
Allocation of the long-lived tangible assets based on geography    
Other countries long-lived tangible assets 2,364,730 2,528,378
Mexico [Member]
   
Allocation of the long-lived tangible assets based on geography    
Other countries long-lived tangible assets 430,039 409,707
Venezuela [Member]
   
Allocation of the long-lived tangible assets based on geography    
Other countries long-lived tangible assets 7,870,266 7,192,073
Other Countries [Member]
   
Allocation of the long-lived tangible assets based on geography    
Other countries long-lived tangible assets $ 857,360 $ 454,405