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Long-Term Debt (Details)
12 Months Ended
Jul. 20, 2013
USD ($)
Dec. 31, 2017
USD ($)
borrowing_base
Dec. 31, 2016
USD ($)
Apr. 01, 2016
USD ($)
Feb. 14, 2012
USD ($)
Long-term debt [Abstract]          
Long-term debt   $ 87,616,000 $ 97,402,000    
Less current maturities   (262,000) (786,000)    
Long-term debt – less current maturities   87,354,000 96,616,000    
Maturities of long-term debt [Abstract]          
2018   262,000      
2019   273,000      
2020   285,000      
2021   84,298,000      
2022   311,000      
Thereafter   2,187,000      
Credit Facility [Abstract]          
Maximum borrowing capacity   300,000,000      
Current borrowing base   $ 135,000,000      
Number of reserve reports prepared by independent petroleum engineers | borrowing_base   1      
Number of reserve report prepared internally | borrowing_base   1      
Number of borrowing base redetermination | borrowing_base   1      
Term of borrowing base redetermination   6 months      
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   3.5      
Line of Credit, Covenant, Extraordinary Expenses Threshold       $ 1,000,000  
Threshold triggering credit repayment per covenants       $ 10,000,000.0  
Interest coverage ratio   23.24      
Total debt to EBITDAX ratio   1.45      
Current ratio   1.48      
Senior Secured Credit Facility [Member]          
Long-term debt [Abstract]          
Long-term debt   $ 84,000,000 93,000,000    
Maturities of long-term debt [Abstract]          
Maturity date of debt instrument   May 16, 2021      
Percentage added to reference rate (in hundredths)   0.50%      
Credit Facility [Abstract]          
Market value of property (in hundredths)   5.00%      
Reduced collateral value (in hundredths)   5.00%      
Interest rate on credit facility (in hundredths)   4.57%      
Senior Secured Credit Facility [Member] | Minimum [Member]          
Maturities of long-term debt [Abstract]          
Percentage added to reference rate (in hundredths)   1.50%      
Credit Facility [Abstract]          
Percentage added to variable rate of interest (in hundredths)   2.50%      
Senior Secured Credit Facility [Member] | Maximum [Member]          
Maturities of long-term debt [Abstract]          
Percentage added to reference rate (in hundredths)   2.50%      
Credit Facility [Abstract]          
Percentage added to variable rate of interest (in hundredths)   3.50%      
Rig Loan Agreement [Member]          
Long-term debt [Abstract]          
Long-term debt   $ 0 535,000    
Rig Loan Agreement [Abstract]          
Amount that can be borrowed under rig loan agreement         $ 7,000,000
Interest rate on debt (in hundredths)         4.26%
Real Estate Lien Note [Member]          
Long-term debt [Abstract]          
Long-term debt   $ 3,616,000 $ 3,867,000    
Real Estate Lien Note [Abstract]          
Fixed interest rate on note (in hundredths) 4.25%        
Monthly installments of principal and interest $ 34,354        
Debt Instrument, Basis Spread on Variable Rate, Expected Rate     1.00%    
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum Expected Rate   7.25%