Marketing and Selling Expenses (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Composition of marketing and selling expenses by principal
Marketing and Selling Expenses	$ 112,304	$ 578,887
Total	$ (112,304)	$ 578,887	$ 504,329	$ 409,386