Supplemental Cash Flow Disclosure (Tables)

9 Months Ended

Sep. 30, 2018

Supplemental Cash Flow Disclosure [Abstract]

Schedule of supplemental cash flow disclosures

	Nine Months Ended  September 30,
(in thousands)	2018			2017
Cash paid during the period for:
Interest	$	2,770		$	645
Non-cash transactions:
Increase in asset retirement obligations	$	3,590		$	5
Decrease in accounts payable and accrued liabilities included in oil and gas properties	$	(491	)	$	(12	)
Non-cash acquisition of Carbon California interests (see note 3)	$	(18,906	)	$	-
Carbon California Acquisition on February 1, 2018 (see note 3)	$	17,114		$	-
Obligations assumed with Seneca asset purchase (see note 2)	$	330		$	-
Accrued dividend for convertible preferred stock (see note 9)	$	148		$	-
Beneficial conversion feature for convertible preferred stock (see note 9)	$	1,125		$	-
Issuance of warrants for investment in affiliates	$	-		$	7,094
Exercise of warrant derivative (see note 3)	$	(1,792	)	$	-