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Summary of Significant Accounting Policies (Details) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2014 Center | Mar. 31, 2013 | Dec. 31, 2013 | Jan. 21, 2014 acre
Oil & Gas properties [Abstract] |  |  |  |  |  |
Unproved | $ 8,164,000 |  |  | $ 7,478,000 |  |
Wells in progress | 1,151,000 |  |  | 0 |  |
Proved | 142,658,000 |  |  | 136,521,000 |  |
Oil & Gas properties | 151,973,000 |  |  | 143,999,000 |  |
Less accumulated depreciation depletion and amortization | (60,370,000) |  |  | (57,077,000) |  |
Net book value | 91,603,000 |  |  | 86,922,000 |  |
Mineral properties | 21,942,000 |  |  | 20,739,000 |  |
Building, land and equipment | 8,334,000 |  |  | 8,334,000 |  |
Less accumulated depreciation | (4,204,000) |  |  | (4,135,000) |  |
Net book value | 4,130,000 |  |  | 4,199,000 |  |
Net properties and equipment | 117,675,000 |  |  | 111,860,000 |  |
Oil and Gas Properties [Abstract] |  |  |  |  |  |
Capitalized costs excluded from amortized cost pool | 9,300,000 |  |  | 7,500,000 |  |
Capitalized costs related to unevaluated properties included in the amortization base | 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 | 1 |  |  |  |  |
Price per barrel for oil at ceiling test (in dollars per barrel) | 98.30 |  |  |  |  |
Price for natural gas at ceiling test (dollars per MMbtu) | 3.989 |  |  |  |  |
Proved property impairments | 0 |  | 5,828,000 |  |  |
Mineral Properties [Abstract] |  |  |  |  |  |
Costs associated with Mount Emmons beginning of year | 20,739,000 |  | 20,739,000 | 20,739,000 |  |
Property purchase | 1,203,000 | [1] |  | 0 | [1] |
Costs at the end of the period | $ 21,942,000 |  |  | $ 20,739,000 |  |
Percentage interest acquired (in hundredths) |  |  |  |  |  | 50.00%
Acres acquired, gross |  |  |  |  |  | 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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