Description Of Business And Significant Accounting Policies (Narrative) (Details) - USD ($)		1 Months Ended	9 Months Ended
	Jan. 26, 2018	Jan. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Description Of Business And Significant Accounting Policies [Line Items]
Material natural gas imbalances			$ 0		$ 0
Unevaluated properties			0		0
Impairment			0	$ 0
Sale of methane facility assets	$ 2,650,000	$ 2,650,000
Accounts receivable			695,000		517,000
Accounts receivable - noncurrent			121,000		$ 242,000
Restatement Adjustment [Member]
Description Of Business And Significant Accounting Policies [Line Items]
Accounts receivable			$ 121,000