GES-Port Charlotte (Details) (USD $)	12 Months Ended	1 Months Ended		3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011 LEAD	Oct. 31, 2011 LEAD MW	Dec. 31, 2012 LEAD GES-Port Charlotte	Dec. 31, 2010 LEAD GES-Port Charlotte	Oct. 31, 2010 LEAD GES-Port Charlotte
GES-Port Charlotte
Amount paid to acquire						$ 2,650,000
Term of the power purchase agreement					20 years
Landfill-gas to electricity facility the construction of which is completed (in megawatts)			2.8
Cost to construct the facility		4,700,000
U.S. Treasury Grant received for the project		1,800,000
Amount of term loan used for financing portion of construction costs	3,600,000
Impairment charge	$ 3,547,000			$ 3,500,000