| Cover | Dec. 27, 2021 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 27, 2021 |
| Entity File Number | 001-38003 |
| Entity Registrant Name | Ramaco Resources, Inc. |
| Entity Central Index Key | 0001687187 |
| Entity Tax Identification Number | 38-4018838 |
| Entity Incorporation, State or Country Code | DE |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | true |
| Common Stock [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Common Stock, $0.01 par value |
| Trading Symbol | METC |
| Security Exchange Name | NASDAQ |
| 9.00% Senior Notes due 2026 [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | 9.00% Senior Notes due 2026 |
| Trading Symbol | METCL |
| Security Exchange Name | NASDAQ |
