Aggregate cash consideration.

No definition available.

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Warrant to purchase common stock.

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No definition available.

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Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

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Number of shares of equity interests issued or issuable to acquire entity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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Amount recognized as of the acquisition date for the assets, including goodwill, in excess of (less than) the aggregate liabilities assumed, less the noncontrolling interest in the acquiree.

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- Definition

Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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- Definition

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

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Amount of the required periodic payments applied to principal.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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- Definition

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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- Definition

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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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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No definition available.

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Number of shares of stock issued during the period pursuant to acquisitions.

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Acquisitions (Details Textual) - USD ($) $ in Thousands						1 Months Ended		6 Months Ended		12 Months Ended
Acquisitions (Details Textual) - USD ($) $ in Thousands	Feb. 01, 2019	Feb. 01, 2018	Nov. 01, 2017	Aug. 15, 2017	Apr. 03, 2017	Dec. 31, 2018	Sep. 29, 2017	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Consisting cash paid amount						$ 25,100
Borrowing revolver increased				$ 8,000				$ 4,029	$ 31,502
Old Ironsides [Member]
Business Acquisition [Line Items]
Cash paid to acquired business						33,000
Consisting cash paid amount						25,030
Aggregate cash consideration						14,158
Principal amount	$ 2,000
Bearing interest of per annum								10.00%
Percentage of aggregate share ownership								72.76%
OIE Membership Acquisition [Member]
Business Acquisition [Line Items]
Principal amount								$ 25,100
Class A Units [Member] \| Yorktown Energy Partners [Member]
Business Acquisition [Line Items]
Units received			2,940
Carbon California [Member]
Business Acquisition [Line Items]
Percentage of aggregate share ownership		56.40%
Carbon California [Member] \| Yorktown [Member] \| Class C Units [Member]
Business Acquisition [Line Items]
Profits interest		38.59%
Percentage of aggregate share ownership		46.96%
Issuance shares of our common stock		1,527,778
Carbon Appalachia [Member]
Business Acquisition [Line Items]
Recognized gain based on fair value								1,300
Cash paid to acquired business								33,000
Acquired Old Ironsides Class A Units								$ 58,100
Equity commitment					$ 100,000	$ 37,000				$ 37,000
Aggregate cash consideration				14,000
Borrowing base, revolver				$ 22,000
Carbon Appalachia [Member] \| Yorktown Energy Partners [Member]
Business Acquisition [Line Items]
Class of warrants					408,000
Carbon Appalachia [Member] \| Class C Units [Member]
Business Acquisition [Line Items]
Acquisitions issuance shares							121
Percentage of aggregate share ownership							27.24%
Carbon Appalachia [Member] \| Class A Units [Member]
Business Acquisition [Line Items]
Cash paid to acquired business										33,000
Aggregate cash consideration					$ 12,000		$ 11,000
Senior secured asset-based revolving credit facility					$ 100,000
Term of senior secured asset-based revolving credit facility					4 years
Initial borrowing base amount					$ 10,000
Acquisitions issuance shares							27,195
Acquired of Class A Units										$ 58,100
Percentage of aggregate share ownership							72.76%
Carbon Appalachia [Member] \| Class A Units [Member]
Business Acquisition [Line Items]
Acquisitions issuance shares							9,805
Percentage of aggregate share ownership							27.24%
Carbon Appalachia [Member] \| Class B Units [Member]
Business Acquisition [Line Items]
Warrant to purchase shares of common stock					1,000
Acquisitions issuance shares							1,000
Percentage of aggregate share ownership							27.24%