Description Of Business And Significant Accounting Policies (Disaggregation Of Revenue) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 3,038,000	$ 4,911,000
Crude Oil [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,015,000	4,884,000
Saltwater Disposal Fees [Member]
Disaggregation of Revenue [Line Items]
Revenue	23,000	27,000
Natural Gas Imbalances [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 0	$ 0