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Related Party Transactions (Narrative) (Details) - USD ($)		12 Months Ended			48 Months Ended	105 Months Ended
	Dec. 18, 2007	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Cost incurred, development costs				$ 252,000
Working interest percent	15.00%
Related party allowance for doubtful accounts receivable		$ 14,000	$ 14,000		$ 14,000	$ 14,000
Accounts receivable-related party, allowance for doubtful accounts		159,000	159,000		159,000	159,000
Accounts receivable - related parties balance
Methane gas sales		$ 4,683,000	4,113,000	$ 5,631,000
Methane Project [Member]
Related Party Transaction [Line Items]
Percent of net profits, interest		7.50%
Hoactzin Partners, L.P. [Member]
Related Party Transaction [Line Items]
Related parties accounts payable		$ 159,000	159,000		159,000	159,000
Past due related parties accounts payable		159,000			159,000	159,000
Hoactzin Partners, L.P. [Member] | Methane Project [Member]
Related Party Transaction [Line Items]
Net profits						0
Methane gas sales					0
Related Party [Member] | Hoactzin Partners, L.P. [Member]
Related Party Transaction [Line Items]
Accounts receivable-related party, allowance for doubtful accounts		159,000	159,000		159,000	159,000
Accounts receivable - related parties balance		$ 159,000	$ 0		$ 159,000	$ 159,000

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