Manufactured Methane (Narrative) (Details) - Methane Project [Member] - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Methane Project [Line Items]
Date methane facilities were placed into service	Apr. 01, 2009
Methane facilities estimated useful life	25 years
Landfill closure date	Dec. 01, 2041
Depreciation expense	$ 15,000	$ 15,000