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Note 1 - Description of Business (Details)	Dec. 31, 2022 a item
Number of mines in operation | item	3
Elk Creek Property
Mining complex | a	20,200

X

- Definition

Refers to the number of mines in operation.

+ References

No definition available.

+ Details

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

X

- Definition

Area of land held.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfLand
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:areaItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=metc_ElkCreekPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: