Note 9 - Equity - Modification (Details) - USD ($)		3 Months Ended
Jun. 21, 2023	Mar. 31, 2024
EQUITY
Incremental compensation costs associated with modifications	$ 0	$ 1,200,000
Incremental value		1,800,000
Reversal of previously recognized compensation expense		600,000
Pre-modified restricted stock award		300,000
Forfeiture of restricted stock units and performance stock units		$ 300,000

Amount of previously recognized share based compensation expense.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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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

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

- Definition

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

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

Name:	us-gaap_EquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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