Costs and Estimated Earnings on Uncompleted Contracts (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Summary of costs and estimated earnings on uncompleted contracts
Costs incurred on uncompleted contracts	$ 317,022	$ 177,529
Provision for loss on uncompleted contracts	(58,433)	(6,680)
Estimated earnings	72,710	19,516
Cost on uncompleted contracts, net	331,299	190,365
Less: billings to date	(316,552)	(223,678)
Cost in excess of billing on uncompleted contracts, net	$ 14,747	$ (33,313)