Represent number of dividend rights.

No definition available.

Name:	metc_NumberOfDividendRights
Namespace Prefix:	metc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represent number of voting rights

+ References

No definition available.

+ Details

Name:	metc_NumberOfVotingRights
Namespace Prefix:	metc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of previously recognized share based compensation expense.

+ References

No definition available.

+ Details

Name:	metc_ReversalOfPreviouslyRecognizedStockBasedCompensationExpense
Namespace Prefix:	metc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of previously recognized share based compensation expense relating to forfeiture of awards.

+ References

No definition available.

+ Details

Name:	metc_ReversalOfPreviouslyRecognizedStockBasedCompensationExpenseRelatingToForfeitureOfAwards
Namespace Prefix:	metc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of previously recognized share based compensation expense relating to pre-modified awards.

+ References

No definition available.

+ Details

Name:	metc_ReversalOfPreviouslyRecognizedStockBasedCompensationExpenseRelatingToPreModifiedAwards
Namespace Prefix:	metc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The number of shares converted from each common unit.

+ References

No definition available.

+ Details

Name:	metc_SaleOfStockConversionOfEachCommonUnit
Namespace Prefix:	metc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of potential earnings of award under share-based payment arrangement.

+ References

No definition available.

+ Details

Name:	metc_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardPotentialEarningsPercentage
Namespace Prefix:	metc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of incremental value from equity vesting provision in share based compensation payment arrangement.

+ References

No definition available.

+ Details

Name:	metc_ShareBasedCompensationArrangementByShareBasedPaymentAwardIncrementalValueFromEquityVestingProvision
Namespace Prefix:	metc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The percent of dividend on tracking stock from financial performance of carbon ore rare earth assets.

+ References

No definition available.

+ Details

Name:	metc_TrackingStockDividendFromFinancialPerformanceOfCarbonOreRareEarthAssetsPercent
Namespace Prefix:	metc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

The per share amount of a dividend declared, but not paid, during the financial reporting period for a tracking stock.

+ References

No definition available.

+ Details

Name:	metc_TrackingStockDividendsDeclaredAmountPerShare
Namespace Prefix:	metc_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

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

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

+ Details

Name:	us-gaap_CommonStockDividendsPerShareCashPaid
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

+ Details

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-SubTopic 405
-Topic 942
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477787/942-405-45-2

+ Details

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

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-3

+ Details

Name:	us-gaap_DividendsPayableAmountPerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(24))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(15)(5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 405
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478790/946-405-45-2

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(15)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

+ Details

Name:	us-gaap_DividendsPayableCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-15

+ Details

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

- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(01)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

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

- Definition

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(2)(iii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

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

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=metc_PerformanceStockUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_GranteeStatusAxis=metc_ShareBasedPaymentArrangementExecutivesAndEmployeeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_GranteeStatusAxis=metc_DirectorsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 6 - Equity - Summary of Restricted Awards Activity (Details) $ / shares in Units, $ in Thousands						3 Months Ended				6 Months Ended
	Jun. 15, 2024 USD ($)	Mar. 15, 2024 USD ($)	Jun. 15, 2023 USD ($) $ / shares	Mar. 15, 2023 USD ($) $ / shares	Dec. 08, 2022 $ / shares	Jun. 30, 2024 USD ($) $ / shares	Mar. 31, 2024 USD ($) Vote $ / shares shares	Jun. 30, 2023 USD ($)	Jun. 30, 2022	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2023 USD ($)	Feb. 01, 2024 $ / shares	Dec. 06, 2023 $ / shares	Dec. 31, 2022 USD ($)
Compensation costs						$ 4,600		$ 3,600		$ 9,300	$ 6,500
Incremental compensation costs associated with modifications							$ 1,200
Incremental value							1,800
Reversal of previously recognized compensation expense							600
Pre-modified restricted stock award							300
Forfeiture of restricted stock units and performance stock units							$ 300
Dividend declared \| $ / shares					$ 0.125
Dividend payable				$ 5,600		$ 297		$ 504		297	504			$ 5,500
Dividends paid amount											$ 11,100
Dividends paid \| $ / shares			$ 0.125	$ 0.125
Payment of dividends			$ 5,600							$ 16,500
Class A Common Stock
Dividend declared \| $ / shares						$ 0.1375
Dividends paid amount		$ 6,000
Payment of dividends	$ 6,100	6,100
Per share amount of a dividend declared \| $ / shares													$ 0.1375
Class B Common Stock
Granted (in shares) \| shares										0
Dividend payable per share \| $ / shares												$ 0.2416
Dividend declared \| $ / shares						$ 0.2376
Payment of dividends	$ 2,100	$ 2,100
Percentage dividend from financial performance of carbon							20		20	20
Restricted Stock
Fair value of awards							$ 2,500
Vesting period							3 years
Restricted Stock Units
Granted (in shares) \| shares							302,699
Granted, Weighted average grant date fair value (in dollars per share) \| $ / shares							$ 17.58
Fair value of awards							$ 5,300
Vesting period							3 years
Number of voting rights \| Vote							0
Number of dividend rights \| Vote							0
Shares delivered per unit awarded \| shares							1
Payment of dividends										$ 100
Performance Stock Units
Vesting period										3 years
Number of voting rights \| Vote							0
Number of dividend rights \| Vote							0
Executives and Employees \| Restricted Stock
Granted (in shares) \| shares							179,028
Fair value of awards							$ 3,100
Executives and Employees \| Performance Stock Units
Granted (in shares) \| shares										315,941
Granted, Weighted average grant date fair value (in dollars per share) \| $ / shares										$ 28.72
Fair value of awards										$ 9,100
Vesting period							3 years
Shares delivered per unit awarded \| shares							1
Executives and Employees \| Performance Stock Units \| Minimum
Potential earnings (as a percentage)							0.00%
Executives and Employees \| Performance Stock Units \| Maximum
Potential earnings (as a percentage)							200.00%
Directors \| Restricted Stock
Fair value of awards							$ 600
Vesting period							1 year