Summary of Significant Accounting Policies (Details)		3 Months Ended		6 Months Ended		12 Months Ended
		Jun. 30, 2015 USD ($) $ / Barrel $ / MMBTU	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Center	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Jan. 21, 2014 a
Properties and Equipment [Abstract]
Property, plant and equipment		$ 8,320,000		$ 8,320,000		$ 8,346,000
Less accumulated depreciation		(4,509,000)		(4,509,000)		(4,404,000)
Net book value		3,811,000		3,811,000		3,942,000
Oil and Gas Properties [Abstract]
Capitalized costs excluded from amortized cost pool		8,200,000		8,200,000		12,500,000
Capitalized costs related to unevaluated properties included in the amortization base		$ 0		$ 0		0
Percentage of discount used for future net revenue (in hundredths)				10.00%
Period for calculating unescalated average prices prior to the end of reporting period				12 months
Number of cost centers for quarterly ceiling test for oil and gas | Center				1
Price per barrel for oil at ceiling test | $ / Barrel		71.68
Price for natural gas at ceiling test (in dollars per MMbtu) | $ / MMBTU		3.390
Proved property impairments		$ 3,208,000	$ 0	$ 22,448,000	$ 0
Mineral Properties [Abstract]
Costs associated with Mount Emmons beginning of year				21,942,000	$ 20,739,000	20,739,000
Property purchase	[1]			0		1,203,000
Costs at the end of the period		$ 21,942,000		$ 21,942,000		$ 21,942,000
Percentage interest acquired (in hundredths)							50.00%
Acres acquired | a							160
Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives				3 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives				45 years

[1] On January 21, 2014, the Company acquired Thompson Creek Metals' ("TCM") 50% interest in 160 acres of fee land in the vicinity of the Mt. Emmons project mining claims for $1.2 million. The property was originally acquired jointly by the Company and TCM in January 2009.