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Note 2 - Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Summary of Significant Accounting Policies. |  |
Excess fair value of debt over carrying value | $ 36.0 | $ 38.0
Other income recognized related to Coronavirus Aid, Relief and Economic Security Act Employee Retention Tax Credit | $ 5.4 |

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- Definition The amount that the fair value of debt exceeds the carrying value at balance sheet date. + References No definition available. + Details
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Namespace Prefix: | metc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of revenue and income classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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