Note 1 - Organization and Business (Details Textual) - USD ($)		9 Months Ended
	Feb. 08, 2017	Sep. 30, 2017	Sep. 30, 2016
Common Stock, Par or Stated Value Per Share		$ 0.01
Payments of Stock Issuance Costs	$ 3,600,000
Proceeds from Issuance Initial Public Offering	47,700,000
Proceeds from Issuance Initial Public Offering, Net of Issuance Costs	43,700,000
Repayments of Related Party Debt		$ 10,629,275	$ 53,735
Notes Payable to Banks [Member] | Ramaco Carbon, LLC [Member]
Repayments of Related Party Debt	$ 10,700,000
IPO [Member]
Stock Issued During Period, Shares, New Issues	6,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01
Shares Issued, Price Per Share	$ 13.50
Proceeds from Issuance Initial Public Offering, Gross	$ 51,300,000
IPO [Member] | Conversion of Series A Preferred Units Into Common Stock Upon Reorganization [Member]
Stock Issued During Period, Shares, Conversion of Units	12,764,426
IPO [Member] | Common Stock Sold by the Company [Member]
Stock Issued During Period, Shares, New Issues	3,800,000
IPO [Member] | Common Stock Sold by the Stockholders [Member]
Stock Issued During Period, Shares, New Issues	2,200,000