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Long-Term Debt (Details) (USD $)
3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Senior Secured Credit facility [Member]
Jun. 30, 2013
Senior Secured Credit facility [Member]
Oct. 01, 2013
Senior Secured Credit facility [Member]
Apr. 30, 2013
Senior Secured Credit facility [Member]
Dec. 31, 2012
Senior Secured Credit facility [Member]
Jun. 30, 2013
Senior Secured Credit facility [Member]
Maximum [Member]
Jun. 30, 2013
Senior Secured Credit facility [Member]
Minimum [Member]
Jun. 30, 2013
Rig loan agreement [Member]
hp
Dec. 31, 2012
Rig loan agreement [Member]
Jun. 30, 2013
Real estate lien note [Member]
Dec. 31, 2012
Real estate lien note [Member]
May 09, 2008
Real estate lien note [Member]
Jul. 20, 2013
Subsequent Event [Member]
Real estate lien note [Member]
Long-term debt [Abstract]                              
Long-term debt $ 132,657,000 $ 124,758,000 $ 121,000,000 $ 121,000,000     $ 113,000,000     $ 7,000,000 $ 7,000,000 $ 4,657,000 $ 4,758,000 $ 5,400,000  
Less current maturities (1,634,000) (657,000)                          
Long-term debt, excluding current maturities 131,023,000 124,101,000                          
Credit Facility [Abstract]                              
Maximum borrowing capacity     300,000,000 300,000,000                      
Current borrowing base     143,000,000 143,000,000 133,000,000 155,000,000 150,000,000                
Number of reserve reports prepared by independent petroleum engineers       1                      
Number of reserve report prepared internally       1                      
Number of borrowing base redetermination       1                      
Term of borrowing base redetermination     6 months                        
Market value of property (in hundredths)       5.00%                      
Reduced collateral value (in hundredths)       5.00%                      
Percentage added to reference rate (in hundredths)               2.25% 1.25%           1.00%
Percentage added to variable rate of interest (in hundredths)       0.50%       3.25% 2.25%            
Interest rate on credit facility (in hundredths)     3.20% 3.20%                      
Description of variable rate basis       LIBOR                      
Financial covenants, minimum current ratio       1.00                      
Financial covenants, interest coverage ratio       2.50                      
Financial covenants, total debt To EBITDAX ratio       4.00                      
Interest coverage ratio       7.88                      
Total debt to EBITDAX ratio       3.85                      
Current ratio       1.70                      
Rig Loan Agreement [Abstract]                              
Power of diesel electric drilling rig (in horsepower)                   2,000          
Maximum amount that can be borrowed under rig loan agreement                   7,000,000          
Term of interest due on note                   Interest only is due for the first 18-months of the note and thereafter, the note will amortize in full over the remaining life of the note.          
Interest rate on debt (in hundredths)                   4.26%          
Real Estate Lien Note [Abstract]                              
Fixed interest rate on note (in hundredths)                       4.00%     4.25%
Monthly installments of principal and interest                       $ 33,763     $ 34,354
Maturity date of note                       May 15, 2015      
Maximum rate on variable rate note                             7.25%