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Credit Facilities (Details Textual)
 3 Months Ended 6 Months Ended 12 Months Ended
May 01, 2018
USD ($)
May 01, 2018
USD ($)
Feb. 15, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jul. 31, 2018
USD ($)
Mar. 30, 2018
USD ($)
Feb. 01, 2018
Credit Facilities (Textual)                      
Covenant description           A minimum cash balance requirement of $750,000.          
Senior secured asset-based revolving credit facility           $ 31,502,000 $ 600,000        
Effective borrowing rate (as a percent)       5.54%   5.54%          
Deferred issuance costs       $ 58,000,000   $ 58,000,000          
Voting percentage                     43.60%
Carbon California [Member]                      
Credit Facilities (Textual)                      
Effective borrowing rate (as a percent)                     56.40%
Business acquisitions, description    
(i) issued and sold Class A Units to Yorktown and Prudential for an aggregate cash consideration of $22.0 million, (ii) entered into a Note Purchase Agreement (the "Note Purchase Agreement") with Prudential Legacy Insurance Company of New Jersey and Prudential Insurance Company of America for the issuance and sale of up to $25.0 million of Senior Secured Revolving Notes (the "Senior Revolving Notes") due February 15, 2022 and (iii) entered into a Securities Purchase Agreement (the "Securities Purchase Agreement") with Prudential for the issuance and sale of $10.0 million of Senior Subordinated Notes (the "Subordinated Notes") due February 15, 2024. We are not a guarantor of the Senior Revolving Notes or the Subordinate Notes.
                
Unsecured notes due date Feb. 15, 2024                    
Outstanding discount amount of notes       1,368,000   1,368,000          
Voting percentage 53.90% 53.90%                 56.40%
Revolving Notes in the principal amount     $ 10,000,000                
Carbon California- Senior Revolving Notes, Related Party [Member]                      
Credit Facilities (Textual)                      
Borrowing base amount       41,000,000   41,000,000          
Line of credit facility maximum borrowing capacity       38,500,000   38,500,000          
Other long-term assets value       944,000   944,000          
Amortized interest expense       48,000 $ 14,000 $ 77,000 $ 43,000        
Business acquisitions, description    
Prudential Legacy Insurance Company of New Jersey and Prudential Insurance Company of America for the issuance and sale of the Senior Revolving Notes due February 15, 2022. We are not a guarantor of the Senior Revolving Notes. The closing of the Note Purchase Agreement on February 15, 2017, resulted in the sale and issuance by Carbon California of Senior Revolving Notes in the principal amount of $10.0 million. The maximum principal amount available under the Senior Revolving Notes is based upon the borrowing base attributable to Carbon California’s proved oil and gas reserves which is to be determined at least semi-annually. As of June 30, 2018, the borrowing base was $41.0 million, of which $38.5 million was outstanding.
                
Description of the revolver requirements    
The Senior Revolving Notes require Carbon California, as of January 1 and July 1 of each year, to hedge its anticipate proved developed products production at such time for year one, two and three at a rate of 75%, 65% and 50%, respectively. Carbon California may make principal payments in minimum installments of $500,000. Distributions to equity members are generally restricted.
                
Revolving Notes in the principal amount     $ 10,000,000                
Carbon California Notes [Member]                      
Credit Facilities (Textual)                      
Effective borrowing rate (as a percent)     12.00%                
Description of the revolver requirements    
The Subordinated Notes require Carbon California, as of January 1 and July 1 of each year, to hedge its anticipated production at such time for year one, two and three at a rate of 67.5%, 58.5% and 45%, respectively.
                
Amount of unsecured notes issuance   $ 3,000,000 $ 10,000,000                
Total unsecured notes   $ 13,000,000                  
Unsecured notes due date   Feb. 15, 2024 Feb. 15, 2024                
Description of notes prepayment terms          
Prepayment of the Subordinated Notes is currently not available. After February 15, 2019, prepayment is allowed at 100%, subject to a 3.0% fee of outstanding principal. Prepayment is not subject to such fee after February 17, 2020.
          
Outstanding discount amount of notes       923,000   $ 923,000          
Notes issuance additional, description           Prudential received an additional 1,425 Class A Units, representing 5% of total sharing percentage, for the issuance of the Subordinated Notes. Carbon California valued this unit issuance based on the relative fair value by valuing the units at $1,000 per unit and aggregating the amount with the outstanding Subordinated Notes of $10.0 million. The Company then allocated the non-cash value of the units of approximately $1.3 million, which was recorded as a discount to the Subordinated Notes.          
Carbon California-2018 Subordinated Notes [Member]                      
Credit Facilities (Textual)                      
Effective borrowing rate (as a percent) 12.00% 12.00%                  
Description of the revolver requirements  
The Carbon California 2018 Subordinated Notes require Carbon California, as of January 1 and July 1 of each year, to hedge its anticipated production at such time for year one, two and three at a rate of 67.5%, 58.5% and 45%, respectively.
                  
Amount of unsecured notes issuance   $ 3,000,000                  
Unsecured notes due date   Feb. 15, 2024                  
Description of notes prepayment terms  
Prepayment of the Carbon California 2018 Subordinated Notes is currently not available. After February 15, 2019, prepayment is allowed in full subject to a 3.0% fee of outstanding principal. Prepayment is not subject to such fee after February 17, 2020. Distributions to equity members are generally restricted.
       Prepayment of the Carbon California 2018 Subordinated Notes is currently not available. After May 1, 2020, prepayment is allowed in full subject to a 3.0% fee of outstanding principal. Prepayment is not subject to such fee after May 1, 2021.          
Outstanding discount amount of notes $ 482,000 $ 482,000                  
Notes issuance additional, description   Prudential received 585 Class A Units, representing an approximately 2% additional sharing percentage, for the issuance of the Carbon California 2018 Subordinated Notes. Carbon California valued this unit issuance based on the relative fair value by valuing the units at $1,000 per unit and aggregating the amount with the outstanding Carbon California 2018 Subordinated Notes of $3.0 million. The Company then allocated the non-cash value of the units of approximately $490,000, which was recorded as a discount to the Carbon California 2018 Subordinated Notes. As of June 30, 2018, Carbon California had an outstanding discount of $482,000 associated with these notes, which is presented net of the Carbon California 2018 Subordinated Notes within Credit facility-related party on the unaudited consolidated balance sheets. As of June 30, 2018, the Company has $58,000 of deferred costs offsetting the Carbon California 2018 Subordinated Notes.                  
Legacy Texas Bank [Member]                      
Credit Facilities (Textual)                      
Senior secured asset-based revolving credit facility               $ 100,000,000      
Bank credit facility, terms               4 years      
Minimum [Member]                      
Credit Facilities (Textual)                      
Line of credit facility maximum borrowing capacity                   $ 23,000,000  
Maximum [Member]                      
Credit Facilities (Textual)                      
Line of credit facility maximum borrowing capacity                   $ 25,000,000  
Line of Credit [Member]                      
Credit Facilities (Textual)                      
Line of credit facility maximum borrowing capacity       100,000,000   $ 100,000,000          
Variable interest rate basis, description          
(i) the base rate plus an applicable margin between 0.50% and 1.50% or (ii) the Adjusted LIBOR rate plus an applicable margin between 3.50% and 4.50% at our option. The actual margin percentage is dependent on the credit facility utilization percentage. We are obligated to pay certain fees and expenses in connection with the credit facility, including a commitment fee for any unused amounts of 0.50%.
          
Initial borrowing       17,000,000   $ 17,000,000          
Letters of credit       $ 500,000   500,000          
Credit facility drawn amount           $ 23,100,000          
Line of Credit [Member] | Minimum [Member]                      
Credit Facilities (Textual)                      
Funded debt ratio required to be maintained           1.0          
Current ratio required to be maintained           1.0          
Line of Credit [Member] | Maximum [Member]                      
Credit Facilities (Textual)                      
Funded debt ratio required to be maintained           3.5          
Current ratio required to be maintained           1.0          
Subsequent Event [Member] | Minimum [Member]                      
Credit Facilities (Textual)                      
Line of credit facility maximum borrowing capacity                 $ 25,000,000    
Subsequent Event [Member] | Maximum [Member]                      
Credit Facilities (Textual)                      
Line of credit facility maximum borrowing capacity                 $ 28,000,000