Manufactured Methane (Narrative) (Details) - Methane Project [Member] - USD ($)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
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	$ 45,000	$ 122,000