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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.