Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income	$ 473	$ 484
Items not involving cash:
Depreciation, depletion and amortization	7,860	3,471
Accretion of asset retirement obligations	799	303
Unrealized commodity derivative loss	396	5,587
Warrant derivative gain		(225)
Stock-based compensation expense	446	483
Investment in affiliates	(40)	(962)
Gain on derecognized equity investment in affiliate - Carbon California		(5,390)
Amortization of debt costs	405	247
Interest expense paid-in-kind	1,244
Net change in:
Accounts receivable	7,525	(353)
Prepaid expenses, deposits and other current assets	(375)	570
Accounts payable, accrued liabilities and firm transportation contract obligations	(8,611)	(1,416)
Other non-current items	(327)	(1,184)
Net cash provided by operating activities	9,795	1,615
Cash flows from investing activities:
Development and acquisition of properties and equipment	(1,863)	(40,472)
Proceeds received - Carbon California Acquisition		275
Distribution from affiliate	50
Proceeds received - disposition of oil and gas properties	176
Net cash used in investing activities	(1,637)	(40,197)
Cash flows from financing activities:
Proceeds from credit facility and notes payable	4,029	31,502
Proceeds from preferred shares		5,000
Payments on credit facility and notes payable	(13,185)	(14)
Debt issuance costs	(93)	(511)
Contributions to non-controlling interests, net	6	4,985
Net cash (used in) provided by financing activities	(9,243)	40,962
Net (decrease) increase in cash and cash equivalents	(1,085)	2,380
Cash and cash equivalents, beginning of period	5,736	1,650
Cash and cash equivalents, end of period	$ 4,651	$ 4,030