Costs and Estimated Earnings on Uncompleted Contracts (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Costs and estimated earnings on uncompleted contracts
Costs incurred on uncompleted contracts	$ 177,529	$ 424,477
Provision for loss on uncompleted contracts	(6,680)
Estimated earnings	19,516	41
Cost on uncompleted contracts, net	190,365	424,518
Less: billings to date	(223,678)	(358,064)
Cost in excess of billing on uncompleted contracts, net	$ (33,313)	$ 66,454