Note 6 - Related Party Transactions (Details Textual) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2017
Production Royalties Recouped Against Minimum Royalties	$ 57,630	$ 96,008
Payment of Minimum Royaltyies	$ 250,002	$ 416,670

The amount of royalties recouped against the minimum royalties.

No definition available.

Name:	metc_ProductionRoyaltiesRecoupedAgainstMinimumRoyalties
Namespace Prefix:	metc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration