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Amortizable intangible assets (Details) (USD $)	9 Months Ended
Amortizable intangible assets (Details) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of Intangible Assets	$ 24,247	$ 15,457

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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