Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities
Net income (loss)	$ 24,934	$ 25,074	$ (15,417)
Adjustments to reconcile net income (loss) to net cash from operating activities:
Accretion of asset retirement obligations	511	494	405
Depreciation and amortization	19,521	12,423	3,154
Amortization of debt issuance costs	58	569
Stock-based compensation	4,060	2,638	2,820
Deferred income taxes	5,156	109
Changes in operating assets and liabilities:
Accounts receivable	(8,527)	(3,563)	(6,251)
Prepaid expenses and other current assets	723	(629)	(431)
Inventories	(1,076)	(4,127)	(8,539)
Other assets and liabilities	689	(835)	(1,114)
Accounts payable	(7,313)	(1,521)	15,535
Accrued expenses	3,646	5,551	1,369
Net cash from operating activities	42,382	36,183	(8,469)
Cash flow from investing activities:
Purchases of property, plant and equipment	(45,722)	(48,137)	(75,039)
Proceeds from maturities of investment securities		5,200	55,237
Net cash from investing activities	(45,722)	(42,937)	(19,802)
Cash flows from financing activities
Proceeds from borrowings	73,750	28,424
Proceeds from notes payable - related party		3,000
Payments of debt issuance cost		(569)
Repayment of borrowings	(70,335)	(18,950)	(500)
Repayment of notes payable - related party		(3,000)
Repayments of financed insurance payable	(570)	(989)	(127)
Restricted stock surrendered for withholding taxes payable	(20)
Proceeds from issuance of common stock			47,709
Payments of equity offering costs			(1,756)
Repayments to Ramaco Coal, LLC			(10,629)
Payment of distributions			(5,405)
Net cash from financing activities	2,825	7,916	29,292
Net change in cash and cash equivalents and restricted cash	(515)	1,162	1,021
Cash and cash equivalents and restricted cash, beginning of period	7,380	6,218	5,197
Cash and cash equivalents and restricted cash, end of period	6,865	7,380	6,218
Supplemental cash flow information:
Cash paid for interest	999	826	88
Cash paid for taxes
Non-cash investing and financing activities:
Capital expenditures included in accounts payable and accrued expenses	2,902	1,319	5,236
Financed insurance	939	$ 1,276
Additional asset retirement obligations incurred	$ 516		$ 1,813