Earnings (Loss) Per Share (Details)	9 Months Ended
Sep. 30, 2025
Earnings (Loss) Per Share [Abstract]
Awards share in dividends	1

The share of dividends for unvested restricted stock awards with common shares.

No definition available.

Name:	metc_ShareOfDividendsForUnvestedRestrictedStockAwardsWithCommonShares
Namespace Prefix:	metc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration