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Note 11 - Revenue (Details) T in Millions, $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2022 USD ($) T
REVENUES |
Contract term | 1 year
Downward adjustment to revenue | $ | $ 2.8
Contracts with Indexed Based Pricing Mechanisms | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 |
REVENUES |
Outstanding performance obligation, mass | 0.7
Fixed Priced Contracts | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 |
REVENUES |
Outstanding performance obligation, mass | 1.5

X
- Definition Mass of product allocated to performance obligation. + References No definition available. + Details
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Namespace Prefix: | metc_
Data Type: | dtr-types:massItemType
Balance Type: | na
Period Type: | instant

X
- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12A -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL108322424-203045 + Details
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Period Type: | duration

X
- Definition Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=124258985&loc=SL77919359-209981 + Details
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Balance Type: | na
Period Type: | instant

X
- 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
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- Details
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Namespace Prefix: |
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Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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