Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net income (loss)	$ 25,074	$ (15,417)	$ (7,515)
Adjustments to reconcile net income (loss) to net cash from operating activities:
Accretion of asset retirement obligations	494	405	229
Depreciation and amortization	12,423	3,154	252
Amortization of debt issuance costs	569
Costs associated with abandoned offering			3,089
Equity-based compensation	2,638	2,820	299
Deferred income taxes	109
Changes in operating assets and liabilities:
Accounts receivable	(3,563)	(6,251)	(915)
Prepaid expenses	(774)	(715)	183
Inventories	(4,127)	(8,539)	(1,519)
Other assets	(835)	(1,114)	(21)
Accounts payable	(1,521)	15,535	1,864
Accrued expenses	(5,551)	(1,369)	(193)
Net cash from operating activities	36,038	(8,753)	(3,861)
Cash flow from investing activities:
Acquisition of Knox Creek			(303)
Purchases of property, plant and equipment	(48,137)	(75,039)	(16,723)
Purchase of investment securities			(64,783)
Proceeds from maturities of investment securities	5,200	55,237	4,346
Net cash from investing activities	(42,937)	(19,802)	(77,463)
Cash flows from financing activities
Proceeds from notes payable	13,000
Proceeds from notes payable - related party	3,000		4,000
Proceeds from borrowings	15,424
Payments of debt issuance cost	(569)
Repayment of notes payable	(13,000)	(500)
Repayment of notes payable - related party	(3,000)
Repayments of borrowings	(5,950)
Proceeds from issuance of common stock		47,709
Payments of equity offering costs		(1,756)	(2,248)
Proceeds from issuance of Series A preferred units			85,954
Offering costs for Series A preferred units			(2,250)
Advances from Ramaco Coal, LLC			864
Repayments to Ramaco Coal, LLC		(10,629)	(918)
Repayments of financed insurance payable	(989)	(127)	(375)
Payment of distributions		(5,405)
Contributed capital from members			500
Net cash from financing activities	7,916	29,292	85,527
Net change in cash and cash equivalents	1,017	737	4,203
Cash and cash equivalents, beginning of year	5,934	5,197	994
Cash and cash equivalents, end of year	6,951	5,934	5,197
Supplemental cash flow information:
Cash paid for interest	826	88	105
Cash paid for taxes
Non-cash investing and financing activities:
Increase in prepaid expenses and financed insurance payable	1,276		310
Capital expenditures included in accounts payable and accrued liabilities	1,319	5,236	6,452
Financed purchase of equipment			500
Additional asset retirement obligations acquired or incurred		1,813	7,804
Series A preferred units issued in exchange for notes payable – related parties			4,046
Paid-in kind distribution on Series A preferred units			777
Accretion – Series A preferred units		$ 124	$ 247