Refers to the average fixed sales price per ton.

No definition available.

Name:	metc_ContractsWithFixedSalesPricesAverage
Namespace Prefix:	metc_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of major customers accounting for 10% or more of the specified concentration risk benchmark, which includes, but not limited to, sales revenue, accounts receivable, etc.

+ References

No definition available.

+ Details

Name:	metc_NumberOfMajorCustomers
Namespace Prefix:	metc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of committed tons.

+ References

No definition available.

+ Details

Name:	metc_PercentageOfCommittedTons
Namespace Prefix:	metc_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Refers to the term of sales contract.

+ References

No definition available.

+ Details

Name:	metc_RevenueContractTerm
Namespace Prefix:	metc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Mass of product allocated to performance obligation.

+ References

No definition available.

+ Details

Name:	metc_RevenueRemainingPerformanceObligationMass
Namespace Prefix:	metc_
Data Type:	dtr:massItemType
Balance Type:	na
Period Type:	instant

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 20
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-20

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12A

+ Details

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

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=metc_OneCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=metc_TwoCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=metc_ThreeCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=metc_TotalCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=metc_FixedPricedContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=metc_ContractsWithIndexedBasedPricingMechanismsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=metc_TwoThousandAndTwentyFiveCommittedTonsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=metc_TwoThousandAndTwentySixCommittedTonsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=metc_TwoThousandAndTwentySevenCommittedTonsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Revenue (Details) T in Millions, $ in Millions	3 Months Ended		9 Months Ended
Revenue (Details) T in Millions, $ in Millions	Sep. 30, 2025 USD ($) T	Sep. 30, 2024	Sep. 30, 2025 USD ($) T $ / T	Sep. 30, 2024
Revenue [Line Items]
Term of domestic sales contracts			1 year
Increase to revenue (in Dollars) \| $	$ 0.1		$ 0.6
Customer Concentration Risk [Member] \| Revenue Benchmark [Member]
Revenue [Line Items]
Number of major customers	3
Customer Concentration Risk [Member] \| One Customers [Member] \| Revenue Benchmark [Member]
Revenue [Line Items]
Concentration risk percentage	15.00%	22.00%	16.00%
Customer Concentration Risk [Member] \| One Customers [Member] \| Accounts Receivable [Member]
Revenue [Line Items]
Concentration risk percentage			24.00%
Customer Concentration Risk [Member] \| Two Customers [Member] \| Revenue Benchmark [Member]
Revenue [Line Items]
Concentration risk percentage	10.00%		11.00%	23.00%
Customer Concentration Risk [Member] \| Two Customers [Member] \| Accounts Receivable [Member]
Revenue [Line Items]
Concentration risk percentage			14.00%
Customer Concentration Risk [Member] \| Three Customers [Member] \| Revenue Benchmark [Member]
Revenue [Line Items]
Concentration risk percentage	11.00%
Customer Concentration Risk [Member] \| Three Customers [Member] \| Accounts Receivable [Member]
Revenue [Line Items]
Concentration risk percentage			12.00%
Customer Concentration Risk [Member] \| Total Customers [Member] \| Revenue Benchmark [Member]
Revenue [Line Items]
Concentration risk percentage	36.00%		27.00%
Customer Concentration Risk [Member] \| Total Customers [Member] \| Accounts Receivable [Member]
Revenue [Line Items]
Concentration risk percentage			50.00%
Fixed Priced Contracts [Member]
Revenue [Line Items]
Outstanding performance obligation, mass (in US Tons)	0.6		0.6
Average per ton (in Dollars per US Ton) \| $ / T			164
Contracts with Indexed Based Pricing Mechanisms [Member]
Revenue [Line Items]
Outstanding performance obligation, mass (in US Tons)	1.2		1.2
Two Thousand and Twenty-Five Committed Tons [Member]
Revenue [Line Items]
Percentage of committed tons			48.00%
Two Thousand and Twenty-Six Committed Tons [Member]
Revenue [Line Items]
Percentage of committed tons			48.00%
Two Thousand and Twenty-Seven Committed Tons [Member]
Revenue [Line Items]
Percentage of committed tons			3.00%