Related Party Transactions (Narrative) (Details) - USD ($)		3 Months Ended	108 Months Ended
	Dec. 18, 2007	Mar. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Working interest percent	15.00%
Related party allowance for doubtful accounts receivable		$ 14,000	$ 14,000	$ 14,000
Accounts receivable - related parties balance
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
Past due related parties accounts payable		159,000	159,000
Hoactzin Partners, L.P. [Member] | Methane Project [Member]
Related Party Transaction [Line Items]
Net profits			0
Related Party [Member]
Related Party Transaction [Line Items]
Related party allowance for doubtful accounts receivable		159,000	159,000	159,000
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
Accounts receivable - related parties balance		$ 159,000	$ 159,000	$ 0