Manufactured Methane (Details) (Methane Project [Member], USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Methane Project [Member]
Methane Project [Line Items]
Date methane facilities were placed into service	Apr. 01, 2009
Landfill closure date	Dec. 01, 2041
Methane facilities estimated useful life	33 years
Depreciation expense	$ 15,000	$ 41,000