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Quarterly Data And Share Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Data And Share Information [Abstract]
Revenues	$ 2,679us-gaap_OilAndGasRevenue	$ 3,619us-gaap_OilAndGasRevenue	$ 3,985us-gaap_OilAndGasRevenue	$ 3,505us-gaap_OilAndGasRevenue	$ 3,481us-gaap_OilAndGasRevenue	$ 4,034us-gaap_OilAndGasRevenue	$ 3,871us-gaap_OilAndGasRevenue	$ 4,314us-gaap_OilAndGasRevenue	$ 13,788us-gaap_OilAndGasRevenue	$ 15,700us-gaap_OilAndGasRevenue	$ 20,557us-gaap_OilAndGasRevenue
Net income (loss) from continuing operations	(2,014)	425	377	424	638	535	805	978	(788)	2,956	4,244
Net (loss) from discontinued operations					$ (9)	$ (54)	$ (33)	$ (41)		$ (137)	$ (4,311)
Income per common share from continuing operations	$ (0.03)	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.02	$ (0.01)	$ 0.05	$ 0.07
(Loss) per common share from discontinued operations					$ 0.00	$ 0.00	$ 0.00	$ 0.00		$ 0.00	$ (0.07)

The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

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- Definition

Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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- Definition

Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.

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