Manufactured Methane (Narrative) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Methane Project [Member]
Methane Project [Line Items]
Depreciation expense		$ 30,000
Methane Project [Member]
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	$ 31,000