Note 11 - Related Party Transactions (Details Textual) - USD ($)		12 Months Ended
Aug. 20, 2015	Dec. 31, 2017	Dec. 31, 2016
Payment of Minimum Royaltyies		$ 792,000
Ramaco Carbon, LLC [Member]
Operating Lease Semi-Annual Rent	$ 37,500
Payments for Rent		$ 19,000	$ 93,750

Cash payments to lessor's for use of assets under operating leases.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585

Name:	us-gaap_PaymentsForRent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration