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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.

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