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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Bad debt		$ 68
Valuation allowance		(68)
Total deferred tax assets - current
Net operating loss carryforwards	8,187	10,339
Oil and gas properties	2,735	4,445
Property, Plant and Equipment	419	646
Asset retirement obligation	616	801
Tax credits	260	260
Miscellaneous	92	78
Valuation allowance	(12,067)	(16,569)	$ (15,000)
Total deferred tax assets - noncurrent	242
Net deferred tax asset	$ 242

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