Commitments And Contingencies (Narrative) (Details)	1 Months Ended	9 Months Ended	45 Months Ended
	Oct. 31, 2018 USD ($)	Sep. 30, 2018 USD ($) $ / bbl	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2012 USD ($)
Loss Contingencies [Line Items]
Decrease in compensation			$ 445,000
Period of trailing average of WTI		30 days
Drilling and seismic commitment		$ 131,000	$ 131,000
Seismic commitment				$ 32,000
Incidence Of Non-Compliance [Member]
Loss Contingencies [Line Items]
Maximum potential loss					$ 386,000
Subsequent Event [Member]
Loss Contingencies [Line Items]
Cost incurred, development costs	$ 69,000
Minimum [Member]
Loss Contingencies [Line Items]
Compensation reduction until WTI posting | $ / bbl		70
Compensation reimbursement at WTI posting | $ / bbl		85