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Summary of Significant Accounting Policies (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Center
Sep. 30, 2013
Dec. 31, 2013
Jan. 21, 2014
acre
Properties and Equipment [Abstract]            
Property, plant and equipment $ 8,345,000   $ 8,345,000   $ 8,334,000  
Less accumulated depreciation (4,339,000)   (4,339,000)   (4,135,000)  
Net book value 4,006,000   4,006,000   4,199,000  
Oil and Gas Properties [Abstract]            
Capitalized costs excluded from amortized cost pool 10,100,000   10,100,000   7,500,000  
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     1      
Price per barrel for oil at ceiling test (in dollars per barrel) 99.08          
Price for natural gas at ceiling test (dollars per MMbtu) 4.236          
Proved property impairments 0 0 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   $ 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.