Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Mar. 29, 2022	Jun. 30, 2021
Auditor Name	Crowe LLP
Auditor Firm ID	173
Auditor Location	Houston, Texas
Document Type	10-K
Document Annual Report	true
Entity Registrant Name	Ramaco Resources, Inc.
Document Transition Report	false
Document Period End Date	Dec. 31, 2021
Entity File Number	001-38003
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	38-4018838
Entity Address, Address Line One	250 West Main Street
Entity Address, Address Line Two	Suite 1800
Entity Address, City or Town	Lexington
Entity Address, State or Province	KY
Entity Address, Postal Zip Code	40507
City Area Code	859
Local Phone Number	244-7455
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		44,273,388
Entity Public Float			$ 68.8
Entity Central Index Key	0001687187
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false
Common Stock, $0.01 par value [Member]
Title of 12(b) Security	Common Stock
Trading Symbol	METC
Security Exchange Name	NASDAQ
9.00% Senior Notes due 2026
Title of 12(b) Security	9.00% Senior Notes due 2026
Trading Symbol	METCL
Security Exchange Name	NASDAQ