Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Narrative) (Details)

v2.4.0.6
Summary of Significant Accounting Policies (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounting Policies [Line Items]      
Allowance for doubtful accounts receivable, current $ 34 $ 36  
Capitalized costs, oil and gas producing activities, net 13,331 11,857 11,829
Property, Plant and Equipment, Other, Net 10,058 10,512  
Interest paid 13,920 14,922 18,579
Treasury stock, shares 28,613    
General and Administrative Expense [Member]
      
Accounting Policies [Line Items]      
Provision for doubtful accounts 0 (281) 281
Natural Gas [Member]
      
Accounting Policies [Line Items]      
Gas balancing receivables 93 144  
Gas balancing payable 653 756  
Other Property and Equipment [Member]
      
Accounting Policies [Line Items]      
Property, Plant and Equipment, Other, Net 6,424 3,998  
Accumulated depreciation 13,238 12,688  
Other Property and Equipment [Member] | Minimum [Member]
      
Accounting Policies [Line Items]      
Useful life 3 years    
Other Property and Equipment [Member] | Maximum [Member]
      
Accounting Policies [Line Items]      
Useful life 20 years    
Other Property and Equipment [Member] | General and Administrative Expense [Member]
      
Accounting Policies [Line Items]      
Depreciation 760 645 446
Medusa Spar LLC [Member]
      
Accounting Policies [Line Items]      
Equity method investment, ownership percentage 10.00%    
Undivided Interest [Member] | Medusa Spar LLC [Member]
      
Accounting Policies [Line Items]      
Ownership percentage of production facilities 75.00%    
Callon Entrada [Member]
      
Accounting Policies [Line Items]      
Assets Held-for-sale, at Carrying Value $ 3,634 $ 6,514