Investments in Affiliates (Tables)

12 Months Ended

Dec. 31, 2018

Schedule of Equity Method Investments [Line Items]

Schedule of changes in investments in affiliates

(in thousands)	Carbon California			Carbon Appalachia			Other			Total
Balance, December 31, 2016	$	-		$	-		$	668		$	668
Investment in affiliates gain		-			1,090			38			1,128
Cash distributions		-			-			(68	)		(68	)
Cash contributions		-			6,865			-			6,865
Class B Units issuance		1,854			924			-			2,778
Appalachia Warrant exercise		-			2,896						2,896
Balance, December 31, 2017	$	1,854		$	11,775		$	638		$	14,267
Investment in affiliates gain		-			1,026			85			1,111
Cash distributions		-			-			(125	)		(125	)
California Warrant exercise		(1,854	)		-						(1,854	)
OIE Membership Acquisition					(12,801	)					(12,801	)
Balance, December 31, 2018	$	-			-		$	598		$	598

Carbon California [Member]

Schedule of Equity Method Investments [Line Items]

Schedule of selected historical financial data

(in thousands)	As of December 31, 2018		As of December 31, 2017
Current assets	$	11,829	$	3,968
Total oil and gas properties, net		84,825		43,458
Non-current assets		89,173		44,759
Current liabilities		6,773		6,899
Non-current liabilities		56,664		23,279
Total members’ equity		37,565		18,549

(in thousands)	Year Ended December 31,  2018		Period February 15,  2017 (inception) through December 31,  2017
Revenues	$	32,317	$	7,235
Operating expenses		20,057		9,893
Income (loss) from operations		12,260		(2,658	)
Net income (loss)		8,526		(6,552	)

Carbon Appalachia [Member]

Schedule of Equity Method Investments [Line Items]

Schedule of company's contributions

Timing	Capital  Contribution	Resulting Class A  Units (%)			Resulting  Sharing %
April 2017	$0.24 million		2.00	%		2.98	%
August 2017	$3.71 million		15.20	%		16.04	%
September 2017	$2.92 million		18.55	%		19.37	%
November 2017	Warrant exercise		26.50	%		27.24	%
December 2018	OIE Membership Acquisition		100	%		100	%

Schedule of selected historical financial data

(in thousands)	As of December 31, 2018		As of December 31, 2017
Current assets	$	28,613	$	20,794
Total oil and gas properties, net		80,674		84,402
Non-current assets		96,814		97,762
Current liabilities		22,126		18,207
Non-current liabilities		58,480		59,420
Total members’ equity		44,821		40,929

(in thousands)	Year Ended December 31,  2018		Period April 3, 2017 (inception) through December 31,  2017
Revenues	$	83,541	$	31,584
Operating expenses		77,084		26,764
Income from operations		6,457		4,820
Net income		4,053		3,005