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Percentage of Adjusted PV-10 not to exceed indebtedness.

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Debt instrument, covenant, current ratio.

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Debt instrument, covenant, debt to EBITDA ratio.

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Debt instrument, covenant, interest coverage ratio.

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Debt instrument, covenant, senior revolving notes to EBITDA ratio.

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Amountof fair value of debt discount.

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Percentage of production hedged by commodity derivatives, year one.

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Percentage of production hedged by commodity derivatives, year two.

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Prepayment fee (as a percent).

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Prepayment of subordinated notes allowed, percentage.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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In a business combination achieved in stages, this element represents a narrative description of the history, developments, or effect of the acquisition relative to the percentage of equity in the acquiree held by the acquirer immediately before the acquisition date. Such description may describe any gain recognized as a result of the acquisition.

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Stated value of common units of ownership issued by a limited liability company (LLC).

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Number of common units issued of limited liability company (LLC).

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of the fee that accompanies borrowing money under the debt instrument.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount of the required periodic payments applied to principal.

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Amount, after accumulated amortization, of debt discount.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Credit Facilities and Notes Payable (Details Textual 1) - USD ($) $ in Thousands			12 Months Ended
	May 01, 2018	Feb. 15, 2017	Dec. 31, 2019	Dec. 31, 2018
Credit Facilities and Notes Payable (Textual)
Amortization of deferred issuance costs			$ 846	$ 966
Carbon California [Member]
Credit Facilities and Notes Payable (Textual)
Business acquisitions, description		The sale and issuance by Carbon California of Senior Revolving Notes in the principal amount of $10.0 million.
Prudential [Member] \| Carbon California [Member] \| Senior Revolving Notes [Member]
Credit Facilities and Notes Payable (Textual)
Initial revolving borrowing capacity		$ 25,000
Notes maturity date		Feb. 15, 2022
Principal outstanding			10,000
Borrowing base amount			45,000
Outstanding borrowings			$ 33,000
Effective borrowing rate			7.10%
Commitment fee (as a percent)		0.50%
Annual administrative fee payable		$ 75
Percentage of production hedged by commodity derivatives, year one		75.00%
Percentage of production hedged by commodity derivatives, year two		65.00%
Percentage of production hedged by commodity derivatives, year three		50.00%
Principal payments in minimum installments		$ 500
Current portion of fees			$ 599
Amortization of deferred issuance costs			$ 273	217
Debt instrument, covenant, debt to EBITDA ratio		4.5
Debt instrument, covenant, senior revolving notes to EBITDA ratio		3.5
Debt instrument, covenant, interest coverage ratio		2.0
Debt instrument, covenant, current ratio		1.0
Ownership percentage			46.08%
Prudential [Member] \| Carbon California [Member] \| Senior Revolving Notes [Member] \| LIBOR [Member]
Credit Facilities and Notes Payable (Textual)
Effective borrowing rate		5.50%
Prudential [Member] \| Carbon California [Member] \| Senior Revolving Notes [Member] \| Prime Rate [Member]
Credit Facilities and Notes Payable (Textual)
Effective borrowing rate		4.50%
Prudential [Member] \| Carbon California [Member] \| Subordinated Notes [Member]
Credit Facilities and Notes Payable (Textual)
Notes maturity date		Feb. 15, 2024
Principal outstanding			$ 10,000
Percentage of production hedged by commodity derivatives, year one		67.50%
Percentage of production hedged by commodity derivatives, year two		58.50%
Percentage of production hedged by commodity derivatives, year three		45.00%
Amortization of debt discount			178	58
Interest rate (as a percent)		12.00%
Number of common units issued		1,425
Increase in sharing percentage by noncontroling interest		5.00%
Fair value per Class A unit		$ 1,000
Fair value of debt discount		1,300
Outstanding discount amount of notes			735
Proceeds from debt		$ 30,000
Principal prepayment allowed (as a percent)		100.00%
Prepayment fee (as a percent)		3.00%
Debt instrument, covenant, debt to EBITDA ratio		5.18
Debt instrument, covenant, senior revolving notes to EBITDA ratio		4.03
Debt instrument, covenant, interest coverage ratio		1.6
Debt instrument, covenant, current ratio		0.85
Percentage of adjusted PV-10 not to exceed indebtedness		0.65%
Prudential [Member] \| Carbon California [Member] \| 2018 Subordinated Notes [Member]
Credit Facilities and Notes Payable (Textual)
Notes maturity date	Feb. 15, 2024
Principal outstanding			3,000
Percentage of production hedged by commodity derivatives, year one	67.50%
Percentage of production hedged by commodity derivatives, year two	58.50%
Percentage of production hedged by commodity derivatives, year three	45.00%
Amortization of debt discount			84	$ 57
Interest rate (as a percent)	12.00%
Number of common units issued	585
Increase in sharing percentage by noncontroling interest	2.00%
Fair value per Class A unit	$ 1,000
Fair value of debt discount	490
Outstanding discount amount of notes			$ 349
Proceeds from debt	$ 3,000
Principal prepayment allowed (as a percent)	100.00%
Prepayment fee (as a percent)	3.00%