Manufactured Methane Facilities (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Methane Project [Line Items]
Depreciation expense	$ 101,000	$ 170,000	$ 258,000
Asset Impairment Charges	2,796,000
Methane Project [Member]
Methane Project [Line Items]
Depreciation expense	163,000	136,000	101,000
Asset Impairment Charge Net Of Tax	$ 1,700,000