Supplemental Disclosure to Cash Flows (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of supplemental non-cash and other cash flow information
Cash paid for income taxes-net	$ 1,079,022	$ 51,864	$ 703,982
Non-Cash Transactions
Property and equipment purchases in accounts payable	112,752	80,618	156,213
Purchase of assets under capital lease obligations	146,967
Reversal of tax benefit from stock options forfeited			$ 329,143