The proceeds from notes payable from related parties.

No definition available.

Name:	metc_ProceedsFromNotesPayableRelatedParty
Namespace Prefix:	metc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

+ Details

Name:	us-gaap_DebtConversionConvertedInstrumentAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow from a borrowing supported by a written promise to pay an obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromNotesPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=metc_NotesPayable1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=metc_NotesPayable2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=metc_MidVolCoalSalesIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtConversionByUniqueDescriptionAxis=metc_AmountDueToRamacoCarbonLLCConvertedToTheNotePayablesAmountForRamacoCarbonLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 8 - Notes Payable (Details Textual) - USD ($)					12 Months Ended
Note 8 - Notes Payable (Details Textual) - USD ($)	Dec. 30, 2016	Aug. 31, 2016	Jul. 21, 2016	Jun. 09, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Proceeds from Notes Payable - Related Party						$ 4,000,000
Notes Payable 1 [Member]
Debt Instrument, Interest Rate, Stated Percentage			6.00%	6.00%
Proceeds from Notes Payable - Related Party				$ 2,800,000
Notes Payable 2 [Member]
Proceeds from Notes Payable - Related Party			$ 1,200,000
Mid-Vol Coal Sales Inc. [Member]
Proceeds from Notes Payable	$ 500,000
Amount Due to Ramaco Carbon, LLC converted to the Note Payables Amount for Ramaco Carbon, LLC [Member]
Debt Conversion, Converted Instrument, Amount		$ 10,600,000