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Summary of Significant Accounting Policies (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
$ / Barrel
$ / MMBTU
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Center
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Jan. 21, 2014
a
Properties and Equipment [Abstract]            
Property, plant and equipment $ 8,166,000   $ 8,166,000   $ 8,346,000  
Less accumulated depreciation (4,500,000)   (4,500,000)   (4,404,000)  
Net book value 3,666,000   3,666,000   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     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 59.21          
Price for natural gas at ceiling test (in dollars per MMbtu) | $ / MMBTU 3.060          
Proved property impairments $ 21,446,000 $ 0 $ 43,894,000 $ 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           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.