Deferred Project Costs (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 Project	Dec. 31, 2011
Deferred Project Costs [Abstract]
Number of in-process efficiency lighting and water conservation projects	3
Total deferred project costs, net of amounts amortized and written off	$ 609,000	$ 692,000
Deferred project costs, current	33,431	46,367
Deferred project costs, long-term	575,635	646,051
Deferred project costs amortized to cost of revenue earned	34,000	34,000
Deferred project costs written off	$ 57,000	$ 32,000