XML 95 R32.htm IDEA: XBRL DOCUMENT
v3.22.4

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: |