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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

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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