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Long-Term Debt (Details)
9 Months Ended
Apr. 01, 2016
USD ($)
Sep. 30, 2017
USD ($)
report
Nov. 06, 2017
USD ($)
Dec. 31, 2016
USD ($)
Long-term debt [Abstract]        
Long-term debt   $ 67,680,000   $ 97,402,000
Less current maturities   (259,000)   (786,000)
Long-term debt – less current maturities   67,421,000   96,616,000
Credit Facility [Abstract]        
Maximum borrowing capacity   300,000,000    
Current borrowing base   $ 115,000,000    
Number of reserve reports prepared by independent petroleum engineers | report   1    
Number of reserve report prepared internally | report   1    
Financial Covenants, Minimum Current Ratio   1.0    
Financial covenants, interest coverage ratio   2.5    
Financial covenants, total debt To EBITDAX ratio   3.5    
Interest Coverage Ratio   20.77    
Total debt to ebitdax ratio   1.29    
Current Ratio   1.88    
Line of Credit, Covenant, Cash and Liquid Investments Triggering Credit Repayment $ 10,000,000      
Senior Secured Credit Facility [Member]        
Long-term debt [Abstract]        
Long-term debt   $ 64,000,000   93,000,000
Credit Facility [Abstract]        
Market value of property (in hundredths)   5.00%    
Reduced collateral value (in hundredths)   5.00%    
Percentage added to variable rate (in hundredths)   0.50%    
Interest rate on credit facility (in hundredths)   4.23%    
Line of Credit, Minimum Default Interest Rate 3.00%      
Senior Secured Credit Facility [Member] | Minimum [Member]        
Credit Facility [Abstract]        
Percentage added to reference rate (in hundredths)   1.50%    
Percentage added to variable rate (in hundredths)   2.50%    
Senior Secured Credit Facility [Member] | Maximum [Member]        
Credit Facility [Abstract]        
Percentage added to reference rate (in hundredths)   2.50%    
Percentage added to variable rate (in hundredths)   3.50%    
Rig Loan Agreement [Member]        
Long-term debt [Abstract]        
Long-term debt   $ 0   535,000
Real Estate Lien Note [Member]        
Long-term debt [Abstract]        
Long-term debt   $ 3,680,000   $ 3,867,000
Credit Facility [Abstract]        
Maturity date of debt instrument   Jul. 20, 2023    
Real Estate Lien Note [Abstract]        
Fixed interest rate on note (in hundredths)   4.25%    
Monthly installments of principal and interest   $ 34,354    
Interest rate adjustment over prime (in hundredths)   1.00%    
Real Estate Lien Note [Member] | Maximum [Member]        
Real Estate Lien Note [Abstract]        
Interest rate adjustment over prime (in hundredths)   7.25%    
Subsequent Event [Member]        
Credit Facility [Abstract]        
Current borrowing base     $ 135,000,000