Oil And Gas Properties (Schedule Of Oil And Gas Properties) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Oil And Gas Properties [Abstract]
Oil and gas properties, at cost	$ 5,042,000		$ 5,042,000		$ 8,286,000
Unevaluated properties	552,000		552,000		552,000
Oil and gas properties	5,594,000		5,594,000		$ 8,838,000
Depletion expense			806,000	$ 1,974,000
Impairment	$ 632,000	$ 7,189,000	$ 2,718,000	$ 7,189,000